add helloWorldNode app

Author: gambitier

session 6/HelloWorldApp/.discountenv

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+everydayDiscount = 20
+weeekendDiscount=5
+diwaliDiscount=5

session 6/HelloWorldApp/.env

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+PORT_Number=3300

session 6/HelloWorldApp/.gitignore

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+node_modules

session 6/HelloWorldApp/configuration.js

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+// or just write => require('dotenv').config();
+// which uses defult configs
+require('dotenv').config();
+const PortNumber = process.env.PORT_Number;
+module.exports = {
+	PortNumber,
+};

session 6/HelloWorldApp/discountConfig.js

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+require('dotenv').config({ path: __dirname + '/.discountenv' });
+
+console.log('diwali discount is: ', process.env.diwaliDiscount);

session 6/HelloWorldApp/index.js

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+const envConfig = require('./configuration');
+const discountenvConfig = require('./discountConfig');
+const http = require('http');
+
+console.log('port number is ' + envConfig.PortNumber);
+const port = envConfig.PortNumber || 3000;
+
+const server = http.createServer((req, res) => {
+	res.statusCode = 200;
+	const msg = 'Hello Node!';
+	res.end(JSON.stringify({ data: msg }));
+});
+
+server.listen(port, () => {
+	console.log(`Server running on http://localhost:${port}/`);
+});

session 6/HelloWorldApp/package-lock.json

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+{
+	"name": "heelonode",
+	"version": "1.0.0",
+	"description": "",
+	"main": "index.js",
+	"scripts": {
+		"test": "echo \"Error: no test specified\" && exit 1",
+		"start": "node index.js",
+		"start:dev": "node index.js --watch"
+	},
+	"author": "",
+	"license": "ISC",
+	"dependencies": {
+		"dotenv": "^16.0.0",
+		"lodash": "^4.17.21"
+	}
+}