Add README with acknowledgement to Georgiy Treyvus

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DavidLiedle

README.md

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+# Postgres Is Enough
+
+A love letter to PostgreSQL — exploring how far you can push it as a relational DB, document store, job queue, key-value store, vector database, time-series store, and beyond. With the right extensions and knowledge, Postgres is enough.
+
+Read it at: **https://cloudstreet-dev.github.io/Postgres-is-Enough/**
+
+## License
+
+[CC0 1.0 Universal](LICENSE) — public domain.
+
+## Acknowledgements
+
+Thank you to **Georgiy Treyvus**, CloudStreet Product Manager, for his support and encouragement throughout this project.