Add deprecation notice

Change-Id: If3a46a52fae4ff81434197b4977b9a5ded5682b2

README.md

diff --git a/README.md b/README.md
index 10a5aa8..753a04b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# Plugin to collect Git repository metrics
+# DEPRECATION NOTICE
+
+GerritForge has decided to [change the license to BSL](https://gitenterprise.me/2025/09/30/re-licensing-gerritforge-plugins-welcome-to-gerrit-enterprise/)
+therefore the Apache 2.0 version of this plugin is deprecated.
+The recommended version of the git-repo-metrics plugin is on [GitHub](https://github.com/GerritForge/git-repo-metrics)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/git-repo-metrics,general).
+
+# Plugin to collect Git repository metrics (DEPRECATED)
 
 This plugin allows a systematic collection of repository metrics. It's primary use-case is
 with Gerrit, however it's possible for it to work with multiple Git SCM systems, including bare