Update README.md

Author: gorkem-cetin

plugins/README.md

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+## Countly plugins 
+
+Countly provides a seamless experience to extend core mobile analytics and marketing functionality with the help of plugins. Each plugin is a means to be an add-on to what Countly can do, and help product managers and marketing people understand more about their mobile application. 
+
+We provide extensive documentation on bow to build your own plugins. Head over to [resources.count.ly](http://resources.count.ly) to get an understanding of how plugins work, with the help of a sample plugin. 
+
+If you are ready to submit your plugin, we would be happy to evaluate it and include it in our next release. Please [file a bug on Github](https://github.com/countly/countly-server/issues/new?title=New%20Plugin%20Submission:%20[your%20plugin%20name%20here]&body=Plugin%20Name:%0APlugin%20Url:%0APlugin%20Description:)