update readme

Author: abhishekg999

README.md

@@ -3,5 +3,7 @@
 ## Description
 A fully functional markdown supported notepad, powered by **MDXEditor**. 
 
-By default, the notepad is stored in localStorage by default giving you around 5-10MB of storage (in Chrome for example)
+By default, the notepad is stored in localStorage by default giving you around 5-10MB of storage varying on the browser.
+
+Optionally you may login via GitHub OAuth. This project uses **Neon Postgres serverless** over **Drizzle-ORM**'s neon-http binding to store notepad content in the database on a per user basis.