brew-bundle: add page (#3469)

pages/osx/brew-bundle.md

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+# brew bundle
+
+> Bundler for Homebrew, Homebrew Cask and the Mac App Store.
+> More information: <https://github.com/Homebrew/homebrew-bundle>.
+
+- Install packages from a Brewfile at the current path:
+
+`brew bundle`
+
+- Install packages from a specific Brewfile at a specific path:
+
+`brew bundle --file={{path/to/file}}`
+
+- Create a Brewfile from all installed packages:
+
+`brew bundle dump`
+
+- Uninstall all formulae not listed in the Brewfile:
+
+`brew bundle cleanup --force`
+
+- Check if there is anything to install or upgrade in the Brewfile:
+
+`brew bundle check`
+
+- Output a list of all entries in the Brewfile:
+
+`brew bundle list --all`