Update documentation

virtweb_docs/SETUP_PROD.md

@@ -126,4 +126,24 @@ sudo sysctl -p /etc/sysctl.conf
 
 ```bash
 sudo apparmor_parser -r /etc/apparmor.d/usr.sbin.libvirtd
+```
+
+* Create VirtWeb hook. Set the following content inside `/etc/libvirt/hooks/network`:
+
+```bash
+#!/bin/bash
+NAT_MODE=1 /usr/local/bin/virtweb_backend --storage /home/virtweb/storage --network-name "$1" --operation "$2" --sub-operation "$3"
+```
+
+* Make the script executable:
+
+```bash
+sudo chmod +x /etc/libvirt/hooks/network
+```
+
+* Restart `libvirtd` and `VirtWeb`:
+
+```bash
+sudo systemctl restart libvirtd
+sudo systemctl restart virtweb
 ```