Update 'README.md'

README.md

@@ -1,3 +1,31 @@
 # QuakeLiveDocker
 
-Dockerised Quake Live server.
+Dockerised Quake Live server.
+
+Run with the following environment variables:
+
+```
+HOSTNAME       (default: Quake)
+GAME_PORT      (default: 27960)
+RCON_PORT      (default: 28960)
+PASSWORD       (default: none)
+RCON_PASSWORD  (default: none)
+STATS_PASSWORD (default: none)
+```
+
+Example `docker-compose.yml` file:
+
+```yml
+version: '3'
+services:
+  quakelive:
+    image: docker.nexus.jacknet.io/jackhadrill/games/quakelive:latest
+    ports:
+      - '27960:27960/udp'
+      - '27960:27960/tcp'
+      - '28960:28960/tcp'
+    environment:
+      - HOSTNAME=JackNet
+      - PASSWORD=password123
+      - RCON_PASSWORD=superSecurePassword
+```