[FEATURE] Contribution Guide: Declare PSR-2 Coding Style

All PHP code should now follow PSR-2.

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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 ## Coding style
 
 
 ## Coding style
 

-- PHP function keywords are alone on a line
-- Braces "{" must be put in a new line
+- This project follows the [PSR-2](http://www.php-fig.org/psr/psr-2/) Coding Style

 - Files must be in UTF-8 without BOM and use Unix Line Endings (LF)
 
 - Files must be in UTF-8 without BOM and use Unix Line Endings (LF)
 

-The whole project is not clean about that yet, feel free to fix :)
-

 ## Branches
 
 * ```master``` = latest release, e.g. 2.0.1
 ## Branches
 
 * ```master``` = latest release, e.g. 2.0.1