Base level extension that can be forked to build your own!
Currently this extension is set to have an options page, a css page, a popup window for the top right of Chrome, and a javascript page that will inject into a page on page load.
To use this as a base for your extension, go ahead and fork it! For help in forking, click here: https://help.github.com/articles/fork-a-repo/
New to Git? Check out this tutorial: http://rogerdudler.github.io/git-guide/ It may also help to see the overall workflow: http://www.toptal.com/git/git-workflows-for-pros-a-good-git-guide
See https://developer.chrome.com/extensions/getstarted for more help