[WIP] docs: Update docker instructions

.dockerfile

@@ -1,2 +1,6 @@
+# .dockerfile
+.git/
+Dockerfile
+docker-compose.yml
 # .gitignore
 *~

README.md

@@ -126,3 +126,31 @@ Device B: Renderer Process
 ```sh
 $ out/Default/chrome --type=renderer --server-address=<IP ADDR>
 ```
+
+### Run castanets using docker images
+
+For user conveniance, a binary version is shared to community via dockerhub repo.
+
+Usage is straighforward once you installed docker on your system (on debian based OS):
+
+```sh
+sudo apt install docker-compose ; sudo addgroup $USER docker ; su -l $USER
+```
+
+Pull latest built image (or rebuild it from scratch):
+
+```sh
+docker pull rzrfreefr/castanets
+```
+
+Then we'll use docker-compose to setup network between 2 processes and then run
+the browser and renderer:
+
+
+```sh
+git clone --depth 1 https://github.com/tizenteam/Castanets ; cd Castanets
+
+docker-compose --verbose up default # will dislay version to check your setup (Chromium 63.0.3239.1)
+docker-compose up browser # will run browser, wait browser window to be displayed
+docker-compose up renderer # to be run in other shell
+```

docker-compose.yml

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Copyright: 2018-present Samsung Electronics Co., Ltd. and other contributors
+
+version: "2"
+
+networks:
+  castanets-net:
+
+services:
+
+  version:
+    image: rzrfreefr/castanets:latest
+    command: --version
+
+  browser:
+    image: rzrfreefr/castanets:latest
+    command: --no-sandbox https://github.com/samsung/castanets
+    volumes:
+      - /tmp/.X11-unix:/tmp/.X11-unix
+    environment:
+      - DISPLAY=${DISPLAY}
+    networks:
+      castanets-net:
+        aliases:
+         - castanets-host
+
+  renderer:
+    image: rzrfreefr/castanets:latest
+    command: --no-sandbox --type=renderer --server-address=castanets-host
+    networks:
+      - castanets-net