Add deprecation notice

Change-Id: If7920e2148e8659d35811f4ed2323d3fbc81e2ad

README.md

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-# Gerrit DynamoDB ref-db
+# 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 aws-dynamodb-refdb plugin is on [GitHub](https://github.com/GerritForge/aws-dynamodb-refdb)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/aws-dynamodb-refdb,general).
+
+# Gerrit DynamoDB ref-db (DEPRECATED)
 
 This plugin provides an implementation of the Gerrit global ref-db backed by
 [AWS DynamoDB](https://aws.amazon.com/dynamodb/).