Adds a README.md for all to understand the awesomeness of the CI game!

Add a readme based on the jenkins wiki https://wiki.jenkins-ci.org/display/JENKINS/The+Continuous+Integration+Game+plugin

If you want to preview the markup you can paste it into something like: http://dillinger.io/


![selfie-0](http://i.imgur.com/ECv7kDz.gif)