Add Homebrew Support

[leander-hass]

Hi there, really like the concept of this software!
I would like to download it through homebrew. Maybe then your auto-update feature would be easier to implement?

[Lennolium]

Thanks for your suggestion! 🚀

I already thought about submitting swiftGuard to Homebrew Cask, but they are requiring/enforcing some points, which right now swiftGuard can not fulfill:

An app from a code repository that is not notable enough (under 30 forks, 30 watchers, 75 stars).

swiftGuard: 14 forks, 34 watchers and 330 stars.

App fails with GateKeeper enabled on Homebrew supported macOS versions and platforms (e.g. unsigned apps fail on Macs with Apple Silicon/ARM).

swiftGuard is unsigned, as Apple declined my credit card two times without giving a reason. I also tried with a another AppleID, still had no luck. Furthermore, signing python binaries/.apps is a tortuous job :(

Ref: brew.sh docs