Add License

[hongalex]

Describe the feature that you'd like:

Was hoping to see if you were willing to add an open source license like Apache or MIT

[jwhitley]

I'll add that this is effectively a prerequisite to bringing a new maintainer on board, since that entails a new person creating a derivative work as far as copyright law is concerned.

[esm7]

I'm all for that, just not very acquainted on the topic, and will need to learn it a bit!