Update README to indicate project is no longer maintained

Added a note about project maintenance status.

Signed-off-by: Alejandro Do Nascimento <alejandrodnm@gmail.com>

Author: alejandrodnm

README.md

@@ -17,6 +17,8 @@
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+> As of February 2026, this project is no longer being maintained or supported.
+
 A Python library that transforms PostgreSQL into a robust, production-ready retrieval engine for RAG and Agentic applications.
 
 - 🔄 **Automatically create and synchronize vector embeddings** from PostgreSQL data and S3 documents. Embeddings update automatically as data changes.