Allow mk to be installed using homebrew

To ease installation for MacOS users that do not master pip/pipx secrets, it would be useful to allow installation using:

brew install mk

While I already made a formula that allows that, it should be noted that homebrew maintainers have a some minimal popularity requirements for adding new formulas.

If you want to help, be sure that you do star the repo and fork it, both of them are counted towards those limits. Once we rich these limits I will propose it again.

The current homebrew popularity requirements are: 30 forks, 30 watchers and 75 stars

Related: https://github.com/Homebrew/homebrew-core/pull/74903

If you want to make this happen sooner, please be sure that you roke, watch and star the repository, so we can fit the requirements for adding a homebrew recipe.