docs: Update README.md

Author: balazsorban44

README.md

@@ -1,3 +1,6 @@
+> [!NOTE]
+> The Auth.js/NextAuth.js project is not provided by, nor otherwise affiliated with Vercel Inc. or its subsidiaries. Any contributions to this project by individuals affiliated with Vercel are made in their personal capacity.
+
 <p align="center">
   <br/>
   <a href="https://authjs.dev" target="_blank"><img width="96px" src="https://authjs.dev/img/logo-sm.png" /></a>