[md] links to source

tutorials/action_system/action_system.md

@@ -5,6 +5,9 @@ which show how to create, register, and customize custom actions and action grou
 Action system provides an option to handle certain events in a desired way. Action can either be simply a response to some state,
 or be bound to UI element and could be invoked on demand. These UI elements include main menu, context menus and toolbars.
 
+----------------
+[Source code](https://github.com/JetBrains/intellij-sdk/tree/master/code_samples/register_actions)
+
 ----------------
 
 #Working with custom actions.
@@ -422,6 +425,11 @@ and making it return a non-empty array of action Tools Menu should contain an ex
 
 ![Dynamic Action Group](img/dynamic_action_group.png)
 
+----------------
+[Source code](https://github.com/JetBrains/intellij-sdk/tree/master/code_samples/register_actions)
+
+----------------
+