Add instructions to run app as Docker container (#68)

.dockerignore

@@ -0,0 +1,2 @@
+node_modules
+npm-debug.log

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:9
+
+WORKDIR /app
+
+RUN npm install -g contentful-cli
+
+COPY package.json .
+RUN npm install
+
+COPY . .
+
+USER node
+EXPOSE 3000
+
+CMD ["npm", "run", "start:dev"]

README.md

@@ -97,3 +97,34 @@ You can also deploy this app to Heroku:
 
 [![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
 
+
+## Use Docker
+You can also run this app as a Docker container:
+
+Step 1: Clone the repo
+
+```bash
+git clone https://github.com/contentful/the-example-app.nodejs.git
+```
+
+Step 2: Build the Docker image
+
+```bash
+docker build -t the-example-app.nodejs .
+```
+
+Step 3: Run the Docker container locally:
+
+```bash
+docker run -p 3000:3000 -d the-example-app.nodejs
+```
+
+If you created your own Contentful space, you can use it by overriding the following environment variables:
+
+```bash
+docker run -p 3000:3000 \
+  -e CONTENTFUL_SPACE_ID=<SPACE_ID> \
+  -e CONTENTFUL_DELIVERY_TOKEN=<DELIVERY_ACCESS_TOKEN> \
+  -e CONTENTFUL_PREVIEW_TOKEN=<PREVIEW_ACCESS_TOKEN> \
+  -d the-example-app.nodejs
+```