We haven't written this yet...maybe you would like to?
<iframe src="http://ghbtns.com/github-btn.html?user=nooku&repo=guides.nooku.org&type=fork&size=large" height="30" width="100" frameborder="0" scrolling="0" style="width:100px; height: 30px;" allowTransparency="true"></iframe>Read the Contribute page of this book for details.