add readme

plugins/firewalld/readme.md

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+# FirewallD Plugin
+
+This plugin adds some aliases and functions for FirewallD using the `firewalld-cmd` command. To use it, add firewalld to your plugins array.
+
+```
+plugins=(... firewalld)
+```
+
+## Aliases
+
+| Alias | Command                              | Description                  |
+| :---- | :----------------------------------- | :--------------------------- |
+| fw    | `firewall-cmd`                        | Shorthand                    |
+| fwr   | `firewall-cmd --reload`               | Reload current configuration |
+| fwp   | `firewall-cmd --permanent`            | Create permanent rule        |
+| fwrp  | `firewall-cmd --runtime-to-permanent` | Save current configuration   |
+
+## Functions
+
+| Function | Description                                                |
+| :------- | :--------------------------------------------------------- |
+| fwl      | Lists configuration from all active zones and direct rules |