How To Use Git Source Control with Xcode in iOS 7
http://www.raywenderlich.com/51351/how-to-use-git-source-control-with-xcode-in-ios-7
In XCode 4 how do I add a remote GitHub repository to an existing local project?
http://stackoverflow.com/questions/5803768/in-xcode-4-how-do-i-add-a-remote-github-repository-to-an-existing-local-project
Xcode 5 How to go to Repositories window?
http://stackoverflow.com/questions/18952465/xcode-5-how-to-go-to-repositories-window