feat: add port forwarding guide for Gitea

Author: Nitestack

README.md

@@ -134,6 +134,9 @@ public:51820/udp -> local:51820/udp
 
 # SSH (optional, if you want to access the Pi with a URL)
 public:22/tcp -> local:22/tcp
+
+# Gitea
+public:222/tcp -> local:222/tcp
 ```
 
 ## 🛡️ Security