Changes to the readme and added markdown

[OleTraveler]

You can see a preview as to how it looks with the markdown on my github page:

https://github.com/OleTraveler/EngineY

[andrewhavens]

Please merge this request! it would have helped me so much. I still haven't been able to get it installed and running, but these modifications would lead me in the right direction.

[andrewhavens]

...or at least update the parts we need in order to get this thing up and running. I mean, what version of Rake do we need to run the rake tasks?