Added Express server setup

.gitignore

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+**/node_modules/

Backend Development/CRUD Api/index.js

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+// To run this nodejs app, install all dependencies by typing 'npm install' in root directory i.e. CRUD Api
+const express = require('express'); // Express is a javascript library for nodejs. It is used for backend development.
+
+const server = express(); // Creating express server
+
+server.listen(/* port */ 3000, /* callback */ () => {
+    console.log('listening on port 3000... navigate to http://localhost:3000/');
+});