Add section about ngrok for easy testing outside lan

README.md

@@ -186,6 +186,21 @@ sudo docker-compose up -d
 > mount](https://docs.docker.com/engine/storage/bind-mounts/#use-a-bind-mount-with-compose). By default, MongoDB will
 > store the data in `/data/db` directory.
 
+## Ngrok forwarding
+
+If you need to quickly expose the server to the internet for testing purposes, you can use [Ngrok](https://ngrok.com/).
+This tool allows you to create a secure tunnel to your localhost, which can be accessed from anywhere on the internet,
+from a randomly generated ngrok subdomain. If you're using Arch Linux, you can install it from the AUR (e.g. with `paru
+-S ngrok`)
+
+Assuming you're running the server on `localhost:8000`, you can expose it by running:
+
+```bash
+ngrok http 8000
+```
+
+That said, if you're on the same LAN network, you can also use the local IP address of the machine running the server.
+
 ## Configuration
 
 To configure the project, you can either set the environment variables manually or create a `.env` file in the root directory of