add screnshot section
add screnshot section

file:a/README.md -> file:b/README.md
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@
  - [chrisprice](https://github.com/chrisprice) added custom code for swipe handling on mobile
 
 Many thanks to [rayhaanj](https://github.com/rayhaanj), [Mechazawa](https://github.com/Mechazawa), [grant](https://github.com/grant), [remram44](https://github.com/remram44) and [ghoullier](https://github.com/ghoullier) for the many other good contributions.
+
+### Screenshot
 
 [![Screenshot](http://pictures.gabrielecirulli.com/2048-20140309-234100.png)](http://pictures.gabrielecirulli.com/2048-20140309-234100.png)
 

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