Provide an homebrew formula for mac

[ams0]

I took the initiative to create this: https://github.com/ams0/homebrew-instruqt but will be great to have it turn into:

$> brew install instruqt/instruqt/instruqt

[szh]

Yes please! The repo linked in the issue doesn't seem to exist anymore.

[chris-sanders]

Yup please make this official