Add docs badge to README

I just added the badge you requested to your README: ![Inline docs](http://inch-pages.github.io/github/18F/answers.png) (I did not know where to put it, so I *[cough]* put it first :neckbeard: )

Your status page for this project is http://inch-pages.github.io/github/18F/answers

Thanks for giving this a shot!