add screencast gadget

plugins/org.yakindu.sct.doc.user/gadgets/screencast.xml

@@ -6,5 +6,6 @@
 	<Content type="html">
 		<![CDATA[ 
 			<iframe	src="http://player.vimeo.com/video/53438504?autoplay=1&title=0" width="800" height="600" frameborder="0"> </iframe>		
-		]]
+		]]>
+	</Content>
 </Module>