Update README.md

Author: RomanSoloweow

README.md

@@ -9,6 +9,8 @@ If you like or are using this project please give it a star. Thanks!
 2. [License](#License)
 
 ## Features
+### Custom Window with Visual Studio design
+![](https://github.com/SimpleStateMachine/SimpleStateMachineNodeEditor/blob/gh-pages/img/Custom%20window.jpg)
 ### Adding nodes and connections
 ![](https://github.com/SimpleStateMachine/SimpleStateMachineNodeEditor/blob/gh-pages/img/adding.gif)
 ### Undo and redo