[Therion] macOS installation

Hi, macOS users, I just updated my homebrew formulae and installation instructions to build & install Therion using CMAKE - see https://github.com/ladislavb/homebrew-therion <https://github.com/ladislavb/homebrew-therion> Installation was successfully tested on Apple Silicon machine running macOS 12.1 Monterey. Hopefully it still work on older versions but I am not able to test it - feedback is welcome. \Ladislav