Add a license (MIT)

Most people don't know that "no" license can be more restrictive than many licesnses geared towards open source out there.

The MIT license allows people to use your code in commercial and distributed applications as long as they put the MIT license with the copyright notice that attributes the piece (your library) to you.

I am not a lawyer, this is just how I understand it, so don't take my word for it. Most of what I know about licenses is from http://choosealicense.com/.

I am making this PR in case you were among those that actually want what a MIT provides, but thought that not putting in a license does that.

See http://choosealicense.com/no-license/ for more info about not having a license.