Add sample to be used in container template docs

Author: shashankbarsin

app/.dockerignore

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+node_modules
+npm-debug.log

app/Dockerfile

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+FROM node:8
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+RUN npm ci --only=production
+
+COPY . .
+
+EXPOSE 8080
+CMD [ "npm", "start" ]

app/package.json

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+{
+  "name": "my_app",
+  "version": "1.0.0",
+  "description": "Sample used for container templates",
+  "author": "Shashank Barsin",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.16.4"
+  }
+}

app/server.js

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+'use strict';
+
+const express = require('express');
+
+const PORT = 8080;
+const HOST = '0.0.0.0';
+
+const app = express();
+app.get('/', (req, res) => {
+  res.send('Hello world\n');
+});
+
+app.listen(PORT, HOST);
+console.log(`Running on http://${HOST}:${PORT}`);