Added MIT License file

[Protoss78]

Hi,

Thanks for this great visualization project. I forked the project and added the MIT License to it. Mainly because all other used libraries also used this license. Hope this is ok for you?

Thanks, Roman

[Protoss78]

Should fix issue #3

[bfncs]

Could you please merge this or choose another license to clarify under which license this is provided?

Github produced some very helpful content about choosing a license here: https://help.github.com/en/articles/licensing-a-repository

[gunnarmorling]

Just came here to suggest the same thing: please clarify the license. I'd like to re-use this great utility, but right now I really cannot due to the unclear license. Thanks!