Add Unity Lawyers section to README

Added a section for Unity Lawyers regarding trademark affiliation.

Author: unitycoder

README.md

@@ -75,4 +75,5 @@ See https://github.com/unitycoder/UnityLauncherPro/blob/master/CONTRIBUTING.md
 <br>
 Old (winforms) version is here: https://github.com/unitycoder/UnityLauncher
 
-
+### For Unity Lawyers
+These materials are not sponsored by or affiliated with Unity Technologies or its affiliates. “Unity” is a trademark or registered trademark of Unity Technologies or its affiliates in the U.S. and elsewhere.