How can i add features and contribute cocos2dx?

I want to add features on CCArray.

But how could i programming cocos2dx framework source on IDE( for example : xcode, eclipse )?

Can you give me some link or web page to refer?

You can use xCode on Mac OS X, VS on windows.
Then you should use git to manage your codes and use github to pull a request to cocos2d-x.