readme: Add trademark disclaimer

Author: MohamedBassem

README.md

@@ -17,6 +17,8 @@
 
 A self-hostable bookmark-everything app with a touch of AI for the data hoarders out there.
 
+> *Hoarder is an independent, non-commercial project. It is not affiliated with, endorsed by, or connected to Hordr.app or its owners.*
+
 ![homepage screenshot](https://github.com/hoarder-app/hoarder/blob/main/screenshots/homepage.png?raw=true)
 
 ## Features