added contents

Projekte/buildSrc/src/main/groovy/buildlogic.java-library-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 java-library plugin for API and implementation separation.
+    id 'java-library'
+}