add documentation

Author: agallou

README.md

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+# atoum PHPStorm Plugin
+
+Integrates atoum into PHPStorm
+
+
+## Features
+
+Menu entry to go to the test from the tested class.
+
+![Demo](doc/switch.png)
+
+
+## Links
+
+* [atoum](http://atoum.org)
+* [atoum's documentation](http://docs.atoum.org)