Add installation instruction using Homebrew

[tani]

Hello! Thanks for #4 . I propose new instructions using your changes #4 . Cheers!

[kenlunde]

As these additional instructions, which first need to be reviewed and considered, could be added to our other repositories, I think that it is more effective to make the changes on our end, then push them to the repositories.

[tani]

Okey, Until pushing this changes to repository, I keep to watch this repository. Please do effective changes!