Update readme.md

readme.md

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 # Amazon EC2 plugin for CakePHP #
 
-Version 1.0
+Version 1.0 for cake 2.x
 
 This plugin will allow you to interface with [Amazon EC2](http://aws.amazon.com) and perform a subset of the functionality that the EC2 environment offers.
 
@@ -96,6 +96,19 @@ For support and feature requests, please use [Github issues](https://github.com/
 
 For more information about our Professional CakePHP Services please visit the [Cake Development Corporation website](http://cakedc.com).
 
+## Branch strategy ##
+
+The master branch holds the STABLE latest version of the plugin. 
+Develop branch is UNSTABLE and used to test new features before releasing them. 
+
+Previous maintenance versions are named after the CakePHP compatible version, for example, branch 1.3 is the maintenance version compatible with CakePHP 1.3.
+All versions are updated with security patches.
+
+## Contributing to this Plugin ##
+
+Please feel free to contribute to the plugin with new issues, requests, unit tests and code fixes or new features. If you want to contribute some code, create a feature branch from develop, and send us your pull request. Unit tests for new features and issues detected are mandatory to keep quality high. 
+
+
 ## License ##
 
 Copyright 2011, [Cake Development Corporation](http://cakedc.com)