Add a license

[simonsmiley]

Hi,

I forked your project and am using it for one of mine. In your readme, you encourage usage but you don't have a license. If you could add (an open source) one, that would be really great.

If you're interested I can share my modified version (python3 compatible)

[reuterbal]

Hi,

thanks a lot for your great Python Bindings!

I would also appreciate an Open Source License, so I can further employ your project in my Photobooth.

[msmeissn]

(A license is needed for shipping on Linux Distributions. LGPLv2+ might fit.)