Adding maven support to existing IntelliJ module is not available

Here is a brief answer how to get going with Gradle, but most questions remain unanswered.

How to manage development life cycle of IntelliJ plugins with Maven

For a comprehensive read this post : http://labs.bsb.com/2013/11/how-to-manage-development-life-cycle-of-intellij-plugins-with-maven-2/

The post also includes a link to the source code on github.

Making your plugin project use maven in IntelliJ

This is probably not what you are struggling with, but I include it just in case. Supposing you have already started a new plugin project you have two options:

1. Right-click on the project name in the project explorer and choose New > Module
2. Create a pom.xml in the project root, then right-click on it and choose Add as Maven Project

hth