Add link to repro guidelines

README.md

@@ -83,6 +83,6 @@ To discuss this project and participate in the design, we use the [Xamarin.Forms
 
 ### Reporting Bugs
 
-We use [Bugzilla](https://bugzilla.xamarin.com/newbug) to track issues.
+We use [Bugzilla](https://bugzilla.xamarin.com/newbug) to track issues. If at all possible, please submit a [reproduction of your bug](https://gist.github.com/jassmith/92405c300e54a01dcc6d) along with your bug report.