Set default browser, mobile web test parameter and docker compose example

example/compose/README.md

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+[docker-compose.yml](/example/compose/docker-compose.yml) file for setting up selenium grid.
+-----------------------------------------------------
+
+Example compose file which can be used to set up selenium grid hub with emulator nodes connected to it
+![](/images/compose_selenium_grid.png)
+
+Requirements
+============
+docker-compose   
+for `scale:` option docker-compose v1.13.0 and newer is required
+
+Quick Start
+===========
+```bash
+docker-compose up
+```

example/compose/docker-compose.yml

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+version: "2.2"
+services:
+  hub:
+    image: selenium/hub:3.4.0
+    ports:
+      - "4444:4444"
+
+  node_samsung_7.1.1:
+    image: butomo1989/docker-android-x86-7.1.1
+    privileged: true
+    scale: 2
+    ports:
+      - 6080
+    environment:
+      - DEVICE=Samsung Galaxy S6
+      - CONNECT_TO_GRID=True
+      - APPIUM=true
+      - SELENIUM_HOST=hub
+
+  node_nexus_web_7.1.1:
+    image: butomo1989/docker-android-x86-7.1.1
+    privileged: true
+    scale: 2
+    ports:
+      - 6080
+    environment:
+      - DEVICE=Nexus 5
+      - CONNECT_TO_GRID=True
+      - APPIUM=true
+      - SELENIUM_HOST=hub
+      - MOBILE_WEB_TEST=True