Update README.md

Author: maZahaca

README.md

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 # neon-database-postgresql-branching
 This is an experiment for rolling out a Neon (PostgreSQL) database for branching on developer's code pull requests quickly
 
+## Architecture overview
+![image](https://neon.tech/_next/image?url=https%3A%2F%2Fneon-hwp.dreamhosters.com%2Fwp-content%2Fuploads%2F2022%2F07%2Fneon-architecture-2.png&w=3840&q=100)
+
+## Branching
 ![image](https://user-images.githubusercontent.com/1290067/234360589-2235317f-b2fe-4dd8-b363-92873530aeaf.png)
 
 ## Useful links to start from