Add license file

[rugk]

It would be good if you could add a license file to this repo.

Obviously you also have to look for the licenses of the scripts you included and add the licenses too.

Eg. CC-BY used here, the MIT license used by bootstrap and so on.
Also check that all licenses are compatible and all contributors have to accept that their code will be published under this license...

[rugk]

Hey @catholicon, this is a real easy issue to fix. 😃