Improve Readme / landing page

[breznak]

the readme.md isn't very attractive for a random onlooker, although the style itself is very elegant. I'd suggest atleast:

• use the markdown for headlines
• include a picture how the style looks like
• transfer some info from the "doc" pdf to the readme

...I may have time to work on this later

[tohecz]

If you worked on it, I'd be very pleased, this is something I don't really have time to do...