Adds Supabase to list of vector databases (#819)

examples/vector_databases/README.md

@@ -23,6 +23,7 @@ Each provider has their own named directory, with a standard notebook to introdu
 - [Qdrant](https://qdrant.tech/documentation/quick-start/)
 - [Redis](https://github.com/RedisVentures/simple-vecsim-intro)
 - [SingleStoreDB](https://www.singlestore.com/blog/how-to-get-started-with-singlestore/)
+- [Supabase](https://supabase.com/docs/guides/ai)
 - [Typesense](https://typesense.org/docs/guide/)
 - [Weaviate](https://weaviate.io/developers/weaviate/quickstart)
 - [Zilliz](https://docs.zilliz.com/docs/quick-start-1)