This is somewhere to store Bork's formula code and add changes before submitting PRs to Homebrew core. The Bork formula is in Homebrew core at present, so there should be no reason for you to actually use this tap. It is publicly available for testing purposes only.
brew install borksh/tap/<formula>
Or brew tap borksh/tap and then brew install <formula>.
brew help, man brew or check Homebrew's documentation.