network: added firewall-cmd notes

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+# firewall-cmd(1)
+
+Command line interface to the [firewalld(1)][man-firewalld] daemon.
+
+## List current status of the firewall
+```sh
+# List all services and ports for all zones.
+firewall-cmd --list-all
+# List all services.
+firewall-cmd --list-services
+# List all ports.
+firewall-cmd --list-ports
+```
+> Add `--zone <ZONE>` to limit output to a given `ZONE`. Use `--get-zones` to
+> see all available zones.
+
+## Add entries
+```sh
+# Add a service to the firewall, use `--get-services` to list all available
+# service names.
+firewall-cmd --add-service <SERVICE>
+# Add a specific port.
+firewall-cmd --add-port 8000/tcp
+```
+
+## Remove entries
+```sh
+# Remove service.
+firewall-cmd --remove-service <SERVICE>
+# Remove port.
+firewall-cmd --remove-port 8000/tcp
+```
+
+## References
+- man [firewall-cmd(1)][man-firewall-cmd]
+- man [firewalld(1)][man-firewalld]
+
+[man-firewalld]: https://firewalld.org/documentation/man-pages/firewalld.html
+[man-firewall-cmd]: https://firewalld.org/documentation/man-pages/firewall-cmd.html