Add Neo4j database as a requirement

README.md

@@ -13,6 +13,7 @@ Before you proceed, make sure you have installed/created the following applicati
 1. Docker, link at: https://www.docker.com
 2. Supabase, you can self-host the service or create a free Supabase project at: https://supabase.com
 3. Firebase, you can create a free Firebase project at: https://firebase.google.com
+4. Neo4j database, you can create free at: https://neo4j.com
 
 ```
 docker compose up -d