add brew formula into ligo monorepo

type:added Add ligo installation through brew package manager

Changelog details:

Add ligo installation through brew package manager. By using

brew tap ligolang/ligo https://gitlab.com/ligolang/ligo.git
brew install ligolang/ligo/ligo

You can also install one of the three last version by targeting the version after "@" :

brew install ligolang/ligo/ligo@0.49.0