Update README.md

added a screenshot

Author: Athlon1600

README.md

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 # php-proxy-app
 Web Proxy Application built on php-proxy library ready to be installed on your server
 
+![alt text](http://i.imgur.com/KrtU5KE.png?1 "This is how PHP-Proxy looks when installed")
+
 ## Installation
 
 Keep in mind that this is a **project** and not a library. Installing this via *require* would do you not good.