Add Homebrew Cask

[danielbayley]

> brew audit --new --cask colorclocksaver.rb
audit for colorclocksaver: failed
 - GitHub repository not notable enough (<30 forks, <30 watchers and <75 stars)
Error: 1 problem in 1 cask detected

https://docs.brew.sh/Acceptable-Casks#exceptions-to-the-notability-threshold