docs(java-client): add heads up in the java client section

docs/apis-tools/java-client/index.md

@@ -5,6 +5,11 @@ sidebar_label: "Quick reference"
 description: "Provide a job worker that handles polling for available jobs, use SLF4J for logging useful notes, and more."
 ---
 
+:::info
+Starting with 8.7 the Zeebe Java Client will become the new Camunda Java Client. This transition brings a new Java client structure designed to enhance user experience and introduce new features while maintaining compatibility with existing codebases.
+For more information, take a look at the [announcement](../../reference/announcements.md#zeebe-java-client)
+:::
+
 ## Dependencies
 
 To use the Java client library, declare the following Maven dependency in your project: