Add deprecation notice

Change-Id: I2c019128d7e25fc9c5eee80432ca0d5da8edb0d1

README.md

diff --git a/README.md b/README.md
index c7ee16a..3682b98 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# Gerrit pull-replication plugin
+# 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 pull-replication plugin is on [GitHub](https://github.com/GerritForge/pull-replication)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/pull-replication,general).
+
+# Gerrit pull-replication plugin (DEPRECATED)
 
 This plugin can automatically mirror repositories from other systems.