Added Dockerfile and updated README

Author: shiv-io

.dockerignore

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+node_modules
+npm-debug.log

Dockerfile

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+FROM node:10
+
+# Create app directory to hold the app code inside the image
+WORKDIR /usr/src/app
+
+# Install app dependencies
+# A wildcard is used to ensure both package.json AND package-lock.json are copied
+# where available (npm@5+)
+COPY package*.json ./
+
+RUN npm install
+# If you are building your code for production
+# RUN npm ci --only=production
+
+# Bundle app source
+COPY . .
+
+EXPOSE 8080
+CMD npm start