Add link to Maven extension

Author: jjohannes

README.MD

@@ -24,6 +24,10 @@ If you have a suggestion or a question, please [open an issue](https://github.co
 
 There is a [CHANGELOG.md](CHANGELOG.md).
 
+> [!NOTE]
+> There is also a Maven Extension offering similar functionality for Apache Maven builds:
+> [java-module-dependencies-maven-extension](https://github.com/gradlex-org/java-module-dependencies-maven-extension)
+
 # Java Modules with Gradle
 
 If you build Java Modules with Gradle, you should consider using these plugins on top of Gradle core: