The documentation from the homebrew docs is sufficient to creating a new tap. I will add a bit of commentary in addition to the above to discuss the design choices I made when making my homebrew tap & cask for window-switcher.

First of all, I chose to create a repository on GitHub, since that is where my code is stored. Some bikeshedding - what should I name my tap?

Note: [GitHub Only] The brew.sh docs recommended adding a prefix to your homebrew tap repo with homebrew- if you want users to take advantage of the brew tap comamnd. However, when others install or tap from your repo, they do not include the prefix. For example, the repo github.com/sean01zhang/homebrew-formulae can be accessed by executing brew tap sean01zhang/formulae.