Add a LICENSE file please

[coopr]

and thanks!

[coopr]

Ideally, you'd do this https://help.github.com/articles/adding-a-license-to-a-repository/

In my case, I'm asking for this because the automated process we use depends on a response from Github's API https://developer.github.com/v3/licenses/#get-the-contents-of-a-repositorys-license regarding the license of each package we use - and, for this particular package, Github's API provides no response - because there is no detectable license in this repo.