chucknorris: add README (#7186)

plugins/chucknorris/README.md

+# chucknorris
+
+Chuck Norris fortunes plugin for oh-my-zsh
+
+**Maintainers**: [apjanke](https://github.com/apjanke) [maff](https://github.com/maff)
+
+To use it add `chucknorris` to the plugins array in you zshrc file.
+
+```zsh
+plugins=(... chucknorris)
+```
+
+
+Depends on fortune (and cowsay if using chuck_cow) being installed (available via homebrew, apt, ...). Perfectly suitable as MOTD.
+
+
+| Command     | Description                     |
+| ----------- | ------------------------------- |
+| `chuck`     | Print random Chuck Norris quote |
+| `chuck_cow` | Print quote in cowthink         |