Add Readme

Author: johannessteu

Readme.md

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+[![Latest Stable Version](https://poser.pugx.org/t3n/coding-standard/v/stable)](https://packagist.org/packages/t3n/coding-standard) [![Total Downloads](https://poser.pugx.org/t3n/coding-standard/downloads)](https://packagist.org/packages/t3n/coding-standard)
+
+# t3n Coding Standard
+
+The t3n Coding Standard is a set of PHPCS rules based on the PSR-2 standard.
+
+To install this standard you can easily require it via composer:
+
+```bash
+composer require t3n/coding-standard
+```
+
+To check your php files you can now use the t3n standard:
+
+```bash
+phpcs --standard=t3n
+```