Add deprecation notice

Change-Id: I5e541b5e5d0b5d1929d98425d07d91678473fcbb

README.md

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-# Persistent cache for Gerrit, based on ChronicleMap
+# 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 cache-chroniclemap plugin is on [GitHub](https://github.com/GerritForge/cache-chroniclemap)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/cache-chroniclemap,general).
+
+# Persistent cache for Gerrit, based on ChronicleMap (DEPRECATED)
 
 Non-blocking and super-fast on-disk cache libModule for [Gerrit Code Review](https://gerritcodereview.com)
 based on [ChronicleMap on-disk implementation](https://github.com/OpenHFT/Chronicle-Map).