added handle example to readme

Author: gregtzar

README.md

@@ -179,6 +179,7 @@ For more details about the events check the [jQueryUI API documentation](http://
 - Canceling
   - [Connected Lists With Max Size](http://codepen.io/thgreasi/pen/IdvFc)
   - [Connected Lists Without Duplicates](http://codepen.io/thgreasi/pen/uKfyt)
+- [Draggable Handle](http://codepen.io/thgreasi/pen/ihAyr)
 
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