Document docker-compose.yml

docker-compose.yml

@@ -1,4 +1,9 @@
-version: '3.8'
+# Example docker-compose file for BrainzBot
+# Make sure that either environment variables for TOKEN and LISTENBRAINZ_TOKEN are set,
+# or that you set them directly here.
+#
+# You may change the binding of the config.json file to point it to somewhere else.
+# Make sure it exists and contains what's in config.json.example
 
 services:
   brainzbot:
@@ -7,10 +12,8 @@ services:
       - TOKEN=${TOKEN}
       - DATABASE_URL=mongodb://mongodb:27017/brainzbot
       - LISTENBRAINZ_TOKEN=${LISTENBRAINZ_TOKEN}
-    volumes:
+    volumes: # Change the path before the `:` as needed
       - ./config.json:/usr/src/app/config.json
-    ports:
-      - "3000:3000"
     depends_on:
       - mongodb