Add deprecation notice

Change-Id: I12938ecd30d7bd40d71b3abcfa17615297ca75f3

README.md

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-# Account management plugin for Gerrit Code Review
+# 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 account plugin is on [GitHub](https://github.com/GerritForge/account)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/account,general).
+
+# Account management plugin for Gerrit Code Review (DEPRECATED)
 
 A plugin that allows accounts to be deleted from Gerrit via an SSH command or
 REST API.