Add Docker and Docker compose setup options

Dockerfile

@@ -0,0 +1,3 @@
+FROM node:8.7.0-onbuild
+
+EXPOSE 3000

README.md

@@ -35,6 +35,8 @@ This blockchain explorer is intended for private Ethereum chains. As it does not
 
 ## Getting started
 
+### Setup from source
+
 Supported OS: Ubuntu 16.04
 
 Supported Ethereum backend nodes: Parity (Geth is currently not supported as it does not allow account and received/sent tx enumeration)
@@ -47,3 +49,24 @@ Supported Ethereum backend nodes: Parity (Geth is currently not supported as it
 6. Rename `config.js.example` into `config.js` and adjust the file to your local environment
 7. Start the explorer: `npm start`
 8. Browse to `http://localhost:3000`
+
+### Setup using docker
+
+Build then run the container
+```bash
+docker build -t etherchain-light .
+docker run -p 3000:3000 etherchain-light
+```
+
+Or directly bind the config.js file to avoid rebuilding the image
+```bash
+docker run -p "3000:3000" \
+    -v "$(pwd)/config.js":/usr/src/app/config.js \
+    etherchain-light
+```
+
+### Setup using docker-compose
+
+```bash
+docker-compose up
+```

docker-compose.yml

@@ -0,0 +1,8 @@
+version: '2.0'
+
+services:
+  etherchain-light:
+    build: .
+    restart: always
+    ports:
+      - 3000:3000