Added Manta Graph button to README

Author: makosst

README.md

@@ -18,6 +18,7 @@
 [![GitHub Repo stars](https://img.shields.io/github/stars/HelixDB/helix-db)](https://github.com/HelixDB/helix-db/stargazers)
 [![Discord](https://img.shields.io/discord/1354148209005559819?logo=discord)](https://discord.gg/2stgMPr5BD)
 [![LOC](https://img.shields.io/endpoint?url=https://ghloc.vercel.app/api/HelixDB/helix-db/badge?filter=.rs$,.sh$&style=flat&logoColor=white&label=Lines%20of%20Code)](https://github.com/HelixDB/helix-db)
+[![Manta Graph](https://getmanta.ai/api/badges?text=Manta%20Graph&link=helixdb)](https://getmanta.ai/helixdb)
 
 <a href="https://www.ycombinator.com/launches/Naz-helixdb-the-database-for-rag-ai" target="_blank"><img src="https://www.ycombinator.com/launches/Naz-helixdb-the-database-for-rag-ai/upvote_embed.svg" alt="Launch YC: HelixDB - The Database for Intelligence" style="margin-left: 12px;"/></a>