feat: add .env.example file and update README with prerequisites and setup instructions

README.md

@@ -19,8 +19,21 @@ peertube-collector/
 
 ## Prerequisites
 
-- Docker
-- Docker Compose
+**Linux** based OS with the following:
+
+### Software:
+- Docker (with compose support)
+
+### Open ports on localhost/loopback interface:
+- 4444 (Selenium)
+- 7900 (Selenium VNC - Optional)
+
+If needed, you can open these ports in `ufw` by running the following commands:
+```sh
+ufw allow from 172.30.0.1 to 127.0.0.1 port 4444
+ufw allow from 172.30.0.1 to 127.0.0.1 port 7900
+```
+
 
 ## Setup
 
@@ -36,10 +49,16 @@ peertube-collector/
     ```
 
 
-3. Build and start the Docker containers:
+3. Start the Docker containers:
     ```sh
     docker compose up
     ```
+    or in detached mode:
+    ```sh
+    docker-compose up -d
+    ```
+
+The collector will start collecting WebRTC stats from the specified PeerTube instance.
 
 ## Components