Added Swaggydoc to list of libraries

Thanks Ron for the heads up!

Author: rahulsom

README.md

@@ -82,6 +82,7 @@ These are third party tools generated by the Swagger community:
 
 #### Groovy
 - [restapidoc](https://github.com/siemens/restapidoc) - A simple RESTful API documentation plugin for the Grails web application framework.
+- [swaggydoc](http://grails.org/plugin/swaggydoc) - Swagger Documentation for Grails Controllers. [[Source]](https://github.com/rahulsom/swaggydoc)
 
 #### Java
 - [swagger-springmvc](https://github.com/martypitt/swagger-springmvc) - Integration with Spring MVC.