Add contributing info file.

https://help.github.com/articles/setting-guidelines-for-repository-contributors/
Aliance · Nov 18, 2016 · 538e609 · 538e609
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+How to contribute
+---
+
+The contributing rules are simple enough:
+- Use [Github flow](https://guides.github.com/introduction/flow/);
+- Make sure your code satisfied [PSR-2](http://www.php-fig.org/psr/psr-2/) code style;
+- Run tests and make sure they passed.
+
+Thanks! :heart: