added RadarPHP

README.md

 * [PPI Framework 2](http://www.ppi.io) - An interoperability framework.
 * [CakePHP](http://cakephp.org/) - A rapid application development framework.
 * [Phalcon](http://phalconphp.com/en/) - A framework implemented as a C extension.
+* [Radar](https://github.com/radarphp/Radar.Adr) - An Action-Domain-Responder implementation for PHP.
+
+Filters 
+
 
 ## Framework Extras
 *Extras related to web development frameworks.*