Add to homebrew/cask-fonts

[jayqi]

Thank you for maintaining this project! I've really liked JetBrainsMono but I prefer slashed zeroes, so having this option has been great.

homebrew has a cask-fonts repository so that one can install fonts with something like

brew install font-jetbrains-mono-slashed

It would be great for this font to be installable that way. It looks like instructions for submitting to homebrew/cask-fonts are here: https://github.com/Homebrew/homebrew-cask-fonts/blob/master/CONTRIBUTING.md