Add Docker compose file example

.gitignore

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+config/

compose.yaml

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+---
+services:
+  docker-chromium:
+    image: git.mmbradley.ca/michaelbradley/docker-chromium:latest
+    container_name: docker-chromium
+    restart: unless-stopped
+    shm_size: 2gb
+    ports:
+      - '5800:5800'
+    volumes:
+      - ./config:/config
+    environment:
+      LANG: en_CA.UTF-8
+      TZ: America/Toronto
+      KEEP_APP_RUNNING: 1
+      WEB_AUDIO: 1
+      WEB_AUTHENTICATION: 1
+      WEB_AUTHENTICATION_USERNAME: username
+      WEB_AUTHENTICATION_PASSWORD: password
+      SECURE_CONNECTION: 1