Added docker compose file (#48)

* Added docker compose file

* Added documentation to use compose file

README.md

@@ -90,3 +90,10 @@ Appium-Docker-Android can be connected with selenium grid by passing following p
 ```
 $ docker run --privileged -d -p 4723:4723 -e CONNECT_TO_GRID=True -e APPIUM_HOST="127.0.0.1" -e APPIUM_PORT=4723 -e SELENIUM_HOST="172.17.0.1" -e SELENIUM_PORT=4444 -v /dev/bus/usb:/dev/bus/usb --name container-appium appium/appium
 ```
+
+### Docker compose
+There is [an example of compose file](docker-compose.yml) to simulate the connection between selenium hub and appium server mit connected device(s) in docker solution.
+
+```
+$ docker-compose up -d
+```

docker-compose.yml

@@ -0,0 +1,24 @@
+# Note: It requires docker-compose 1.6.0+
+#
+# Usage: docker-compose up -d
+version: '2'
+
+services:
+  # Selenium hub
+  selenium_hub:
+    image: selenium/hub:3.4.0
+    ports:
+      - 4444:4444
+
+  # Appium Docker Android
+  appium_devices:
+    image: appium/appium
+    depends_on:
+      - selenium_hub
+    network_mode: "service:selenium_hub"
+    privileged: true
+    volumes:
+      - /dev/bus/usb:/dev/bus/usb
+    environment:
+      - CONNECT_TO_GRID=True
+      - SELENIUM_HOST=selenium_hub