Create a README.md for this project

It would be nice to have information about this project - it's intent and usage for instance - easily available on the github project page.

Thanks!

[marco-hoyer]

👍

[JensRantil]

👍

[d0ugal]

There now seems to be a README but some simple usage examples would be nice.

[deniszh]

I created issue #45 for discussing Ceres future.