add screencast gadget

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

@@ -3,7 +3,7 @@
 	<ModulePrefs title="getting started">
 		<Require feature="dynamic-height" />
 	</ModulePrefs>
-	<Content type="html"
+	<Content type="html">
 		<![CDATA[ 
 			<iframe	src="http://player.vimeo.com/video/53438504?autoplay=1&title=0" width="800" height="600" frameborder="0"> </iframe>		
 		]]