diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6c01878
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,32 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..64770e4
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,40 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+	id("org.springframework.boot") version "2.2.6.RELEASE"
+	id("io.spring.dependency-management") version "1.0.9.RELEASE"
+	kotlin("jvm") version "1.3.71"
+	kotlin("plugin.spring") version "1.3.71"
+	kotlin("plugin.jpa") version "1.3.71"
+}
+
+group = "com.aitrainer"
+version = "0.0.1-SNAPSHOT"
+java.sourceCompatibility = JavaVersion.VERSION_1_8
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+	implementation("org.jetbrains.kotlin:kotlin-reflect")
+	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+	runtimeOnly("mysql:mysql-connector-java")
+	testImplementation("org.springframework.boot:spring-boot-starter-test") {
+		exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
+	}
+}
+
+tasks.withType<Test> {
+	useJUnitPlatform()
+}
+
+tasks.withType<KotlinCompile> {
+	kotlinOptions {
+		freeCompilerArgs = listOf("-Xjsr305=strict")
+		jvmTarget = "1.8"
+	}
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..f3d88b1
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..a4b4429
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..2fe81a7
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..62bd9b9
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,103 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..2f19c73
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+include ':src'
\ No newline at end of file
diff --git a/src/main/kotlin/com/aitrainer/api/ApiApplication.kt b/src/main/kotlin/com/aitrainer/api/ApiApplication.kt
new file mode 100644
index 0000000..d96019c
--- /dev/null
+++ b/src/main/kotlin/com/aitrainer/api/ApiApplication.kt
@@ -0,0 +1,12 @@
+package com.aitrainer.api
+
+import org.springframework.boot.SpringApplication
+import org.springframework.boot.autoconfigure.SpringBootApplication
+
+@SpringBootApplication
+class ApiApplication {
+}
+
+fun main(args: Array<String>) {
+    SpringApplication.run(ApiApplication::class.java, *args)
+}
diff --git a/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt b/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt
new file mode 100644
index 0000000..8a1ea03
--- /dev/null
+++ b/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt
@@ -0,0 +1,44 @@
+package com.aitrainer.api.controller
+
+import com.aitrainer.api.model.Customer
+import com.aitrainer.api.repository.CustomerRepository
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.*
+import java.util.*
+import javax.validation.Valid
+
+@RestController
+@RequestMapping("/api")
+class CustomerController ( private val customerRepository: CustomerRepository ) {
+    
+    @GetMapping("/customers")
+    fun getAllCustomers(): List<Customer> =
+            customerRepository.findAll()
+
+    @PostMapping("/customers")
+    fun createNewArticle(@Valid @RequestBody customer: Customer): Customer =
+            customerRepository.save(customer)
+
+    @GetMapping("/customers/{id}")
+    fun getCustomerById(@PathVariable(value = "id") customerId: Long): ResponseEntity<Customer> {
+        return customerRepository.findById(customerId).map { customer -> 
+            ResponseEntity.ok(customer)
+        }.orElse(ResponseEntity.notFound().build())
+    }            
+
+    @PutMapping("/customers/{id}")
+    fun updateCustomerById(@PathVariable(value = "id") customerId: Long,
+                          @Valid @RequestBody newCustomer: Customer): ResponseEntity<Customer> {
+
+        return customerRepository.findById(customerId).map { existingCustomer ->
+            val updatedCustomer: Customer = existingCustomer
+                    .copy(name = newCustomer.name, 
+                        firstname = newCustomer.firstname,
+                        sex = newCustomer.sex,
+                        age = newCustomer.age)
+            ResponseEntity.ok().body(customerRepository.save(updatedCustomer))
+        }.orElse(ResponseEntity.notFound().build())
+
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/aitrainer/api/enums/SexEnum.kt b/src/main/kotlin/com/aitrainer/api/enums/SexEnum.kt
new file mode 100644
index 0000000..444e79b
--- /dev/null
+++ b/src/main/kotlin/com/aitrainer/api/enums/SexEnum.kt
@@ -0,0 +1,6 @@
+package com.aitrainer.api.enums
+
+enum class SexEnum (val sex: String) {
+    MAN ("m"),
+    WOMAN("w")
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/aitrainer/api/model/Customer.kt b/src/main/kotlin/com/aitrainer/api/model/Customer.kt
new file mode 100644
index 0000000..7b40f65
--- /dev/null
+++ b/src/main/kotlin/com/aitrainer/api/model/Customer.kt
@@ -0,0 +1,23 @@
+package com.aitrainer.api.model
+
+import com.aitrainer.api.enums.SexEnum
+
+import javax.persistence.Entity
+import javax.persistence.GeneratedValue
+import javax.persistence.GenerationType
+import javax.persistence.Id
+import javax.validation.constraints.NotBlank
+
+@Entity
+data class Customer (
+        @get: NotBlank
+        val name: String = "",
+        
+        val firstname: String,
+        val email: String,
+        val age: Int,
+        val sex: String,
+        
+        @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+        val customer_id: Long? = null
+)
diff --git a/src/main/kotlin/com/aitrainer/api/repository/CustomerRepository.kt b/src/main/kotlin/com/aitrainer/api/repository/CustomerRepository.kt
new file mode 100644
index 0000000..cfb8431
--- /dev/null
+++ b/src/main/kotlin/com/aitrainer/api/repository/CustomerRepository.kt
@@ -0,0 +1,8 @@
+package com.aitrainer.api.repository
+
+import com.aitrainer.api.model.Customer
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface CustomerRepository : JpaRepository<Customer, Long>
\ No newline at end of file
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..40fb793
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,12 @@
+## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
+#spring.datasource.url = jdbc:mysql://localhost:3306/aitrainer?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false
+spring.datasource.url = jdbc:mysql://localhost:3306/aitrainer?serverTimezone=CET&useSSL=false&characterEncoding=UTF-8&allowMultiQueries=true
+spring.datasource.username = aitrainer
+spring.datasource.password = andio2009
+
+
+## Hibernate Properties
+
+
+# The SQL dialect makes Hibernate generate better SQL for the chosen database
+spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
\ No newline at end of file
diff --git a/src/test/kotlin/com/aitrainer/api/ApiApplicationTests.kt b/src/test/kotlin/com/aitrainer/api/ApiApplicationTests.kt
new file mode 100644
index 0000000..e8a12cd
--- /dev/null
+++ b/src/test/kotlin/com/aitrainer/api/ApiApplicationTests.kt
@@ -0,0 +1,13 @@
+package com.aitrainer.api
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class ApiApplicationTests {
+
+	@Test
+	fun contextLoads() {
+	}
+
+}