Added MIT License and some readme

I could assume that code is free to use, but it's always better to have license just to be clear I created a default MIT License plus simple README with link to homepage and copyright informations.

It's probably also good to include these informations inside repository description, there's also place where you can put optional repo website - so it's always easier to find flipclockjs.com if someone comes from github.

Best,
Leszek