ufw: add README (#8227)

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# UFW plugin
This plugin adds completion for managing everybody's favorite Uncomplicated Firewall (UFW),
a simple interface for managing iptables. Learn more about [`UFW`](https://wiki.ubuntu.com/UncomplicatedFirewall).
To use it, add ufw to the plugins array of your zshrc file:
```
plugins=(... ufw)
```
Some of the commands include:
* `allow <port>/<optional: protocol>` add an allow rule
* `default` set default policy
* `delete <port>/<optional: protocol>` delete RULE
* `deny <port>/<optional: protocol>` add deny rule
* `disable` disables the firewall
* `enable` enables the firewall