Update README.md (add disclaimer about trademarks)

README.md

@@ -145,4 +145,9 @@ RWTH Aachen University
 Ahornstr. 55  
 52074 Aachen, Germany   
 
-Mail: atorf at mmi.rwth-aachen.de
\ No newline at end of file
+Mail: atorf at mmi.rwth-aachen.de
+
+
+## Disclaimer
+
+This site is neither affiliated with nor endorsed by the LEGO Group. LEGO, MINDSTORMS, NXT, and EV3 are registered trademarks of the LEGO Group.