Clarified readme file for belt sample

Bob Roth · Bob Roth · commit 4c125bbb4a69 · 2014-10-09T14:46:14.000-04:00
diff --git a/belt/README.md b/belt/README.md
@@ -27,6 +27,9 @@ You will learn how to:
 
 * To contribute code to this repository you must be [signed up as an official contributor](http://blackberry.github.com/howToContribute.html).
 
+**Requirements**
+
+* This sample is only intended for BB10 devices with a trackpad
 
 ## Screenshots ##
 
