added running kontor-javalin with example API

kontor-javalin/build.gradle

@@ -1,14 +1,28 @@
 plugins {
-    id 'org.javamodularity.moduleplugin' version '2.0.0' apply false
+    id 'java'
 }
 
-subprojects {
-    repositories {
-        mavenCentral()
-    }
-    apply plugin: "org.javamodularity.moduleplugin"
+repositories {
+    mavenCentral()
 }
 
+dependencies {
+    implementation libs.javalin   // Pulling in Javalin
+    implementation libs.jackson   // For JSON serialization of persons 
+    implementation libs.slf4j     // To see some Javalin logging
+}
+
+task fatJar(type: Jar) {
+    manifest {
+        attributes 'Main-Class': 'de.thpeetz.kontor.api.Main'
+    }
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+    from { configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) } }
+    with jar
+}
+
+build.dependsOn fatJar
+
 wrapper {
     gradleVersion = "9.2.1"
 }