Adds licensing

[kennethormandy]

Looking for +1s from @chloi and then this is ready to merge in.

[pedromaltez]

@kennethormandy you committed SVG logos for the deployment platforms in 3590038 and SVG logos for the preprocessors in 6c67f8c. Did you create these SVGs? If not, do you remember where you got them? I wanted to use some of the SVGs, but I don’t know what terms are attached to them. I can’t find an SVG logo for jade anywhere else, which led me to think maybe you made it.

Would the proposed license apply to the SVGs as well?

[kennethormandy]

@pedromaltez Yeah, I remade the Jade one and a couple of others, thanks for noticing. :) Broke them out into their own repo for you: https://github.com/chloi/preprocessor-logos

[pedromaltez]

@kennethormandy Aww, brilliant, thanks! And great work. :) I'll direct any further questions at the dedicated repo. And hopefully help out.