Add deprecation notice

Change-Id: I61f4ee0ce240c6c81a3e996b3762740fad2209c1

README.md

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-# events-aws-kinesis
+# 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 events-aws-kinesis plugin is on [GitHub](https://github.com/GerritForge/events-aws-kinesis)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/events-aws-kinesis,general).
+
+# events-aws-kinesis (DEPRECATED)
 Provide producer and consumer of events streamed over
 [AWS kinesis](https://aws.amazon.com/kinesis/).