Set canvas render material for sprites

doc/serenity_docs/serenity_scene_editor.html

@@ -25,6 +25,13 @@
 		<p>
 		<br> 
 		</p>
+		<p>
+		 The project tree is where the project is organized. To be able to add actors to a project there must be an active stage. <br> NOTE: A stage will be bold in the tree view when its active. 
+		</p>
+		<p><img src="images/sn_project_tree.png" width=300 height=300></p>
+		<p>
+		<br> 
+		</p>
 		<p>
 		 The scene view is where most of the work is done. 
 		</p>