Added docker support

Dockerfile

@@ -0,0 +1,16 @@
+# Use the official lightweight Node.js 12 image.
+# https://hub.docker.com/_/node
+FROM node:12-alpine
+# Create and change to the app directory.
+WORKDIR /usr/src/app
+# Copy application dependency manifests to the container image.
+# A wildcard is used to ensure both package.json AND package-lock.json are copied.
+# Copying this separately prevents re-running npm install on every code change.
+COPY / ./
+# Install dependencies.
+RUN npm install
+# Compile to production
+RUN npm run build
+EXPOSE 3000
+# Run the web service on container startup.
+CMD [ "npm", "start" ]