added contents

Projekte/buildSrc/build.gradle

@@ -0,0 +1,9 @@
+plugins {
+    // Support convention plugins written in Groovy. Convention plugins are build scripts in 'src/main' that automatically become available as plugins in the main build.
+    id 'groovy-gradle-plugin'
+}
+
+repositories {
+    // Use the plugin portal to apply community plugins in convention plugins.
+    gradlePluginPortal()
+}

Projekte/buildSrc/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'buildSrc'

Projekte/buildSrc/src/main/groovy/buildlogic.java-application-conventions.gradle

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+plugins {
+    // Apply the common convention plugin for shared build configuration between library and application projects.
+    id 'buildlogic.java-common-conventions'
+
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}

Projekte/buildSrc/src/main/groovy/buildlogic.java-common-conventions.gradle

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+plugins {
+    // Apply the java Plugin to add support for Java.
+    id 'java'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation libs.junit4
+}
+
+java {
+    compileJava.options.encoding = 'UTF-8'
+}
+
+test {
+    useJUnit()
+}

Projekte/buildSrc/src/main/groovy/buildlogic.java-library-conventions.gradle

@@ -0,0 +1,7 @@
+plugins {
+    // Apply the common convention plugin for shared build configuration between library and application projects.
+    id 'buildlogic.java-common-conventions'
+
+    // Apply the java-library plugin for API and implementation separation.
+    id 'java-library'
+}

Projekte/buildSrc/src/main/groovy/buildlogic.jme-application-conventions.gradle

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+import org.gradle.internal.os.OperatingSystem
+
+plugins {
+    // Apply the common convention plugin for shared build configuration between library and application projects.
+    id 'buildlogic.java-common-conventions'
+
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+/**
+ * Check whether jme3-lwjgl (i.e., version 2) should be used instead of jme3-lwjgl3.
+ * This is controlled by existence of the file 'use/lwjgl2'
+ */
+def use_lwjgl2() {
+    return file("${rootProject.projectDir}/use/lwjgl2").exists()
+}
+
+dependencies {
+    if (use_lwjgl2())
+        runtimeOnly libs.jme3.lwjgl
+    else
+        runtimeOnly libs.jme3.lwjgl3
+}
+
+application {
+    if (OperatingSystem.current().isMacOsX() && !use_lwjgl2())
+        applicationDefaultJvmArgs = ['-XstartOnFirstThread']
+}