added screenshot

Author: spacerockzero

README.md

@@ -3,6 +3,8 @@
 [ ![Codeship Status for PracticeJavaScript/practicejavascript.com](https://app.codeship.com/projects/091c0e50-0a7c-0135-8b3c-6ed4d7e33e57/status?branch=master)](https://app.codeship.com/projects/214753)
 [![Build Status](https://travis-ci.org/PracticeJavaScript/practicejavascript.com.svg?branch=master)](https://travis-ci.org/PracticeJavaScript/practicejavascript.com)
 
+![ScreenShot of practicejavascript.com](https://cldup.com/I24bQvI37L.png)
+
 ## Principles
 - Fast, easy to start. No delays.
 - Keep it simple. As few visual elements as possible.