Add Docker Compose documentation

README.md

@@ -27,10 +27,34 @@ To run the captive portal, you will need:
    docker run -d \
    -p 80:3000 \
    --env-file .env \
-   carlgo11/guest-portal:<tag>
+   carlgo11/guest-portal
    ```
 4. Access the captive portal through the webserver's URL.
 
+
+### Deploying with Docker Compose
+
+1. Create a `.env` file with the environment variables found under [#Configuration](Configuration).
+2. Create a `docker-compose.yml` file with the following data:
+```yaml
+version: '3.8'
+services:
+  redis:
+    image: redis/redis-stack-server:latest
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis:/data
+  node:
+    image: carlgo11/guest-portal
+    ports:
+      - 3001:3000
+    env_file: .env
+
+volumes:
+  redis:
+```
+
 ### Creating background images _(Optional)_
 
 By default, the captive portal fetches the Bing Image of the Day to use as the background.
@@ -60,6 +84,27 @@ If you wish to use this, follow these steps:
    +  -v $(pwd)/backgrounds:/app/public/img/backgrounds \
       carlgo11/guest-portal
     ```
+   If using Docker Compose, link the directory by adding the following lines to `docker-compose.yml`:
+    ```diff
+      version: '3.8'
+      services:
+        redis:
+          image: redis/redis-stack-server:latest
+          ports:
+            - "6379:6379"
+          volumes:
+            - redis:/data
+        node:
+          image: carlgo11/guest-portal
+    +      volumes:
+    +      - ./backgrounds:/app/public/img/background
+          ports:
+            - 3001:3000
+          env_file: .env
+  
+      volumes:
+        redis:
+    ```
 
 #### Static backgrounds