Added Javascript Directory + Beginner Express.js Tutorial

JavaScript/Node.js/Express.js/Beginner API/.gitignore

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+node_modules
+package-lock.json

JavaScript/Node.js/Express.js/Beginner API/README.md

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+# Beginner Express.js Server
+
+This is a quick tutorial for beginners to learn Express.js
+
+- You will need to have [Node.js](https://nodejs.org/en/) installed prior to starting this tutorial.
+_(If this is your first time downloading Node.js, restart your PC after install, or else NPM commands will not work.)_
+
+- I recommend downloading the [Postman](https://www.getpostman.com/) client in order to test your endpoints.
+
+## How to start the server
+Using your terminal either via your OS or VS Code, run the two commands below, in this order:
+1. **npm install**
+2. **npm start**
+
+Once you've completed the setup, you should see the following in the console after running the above commands:
+```
+[nodemon] 1.19.3
+[nodemon] to restart at any time, enter `rs`
+[nodemon] watching dir(s): *.*
+[nodemon] watching extensions: js,mjs,json
+[nodemon] starting `node app.js`
+Server started successfully!
+```

JavaScript/Node.js/Express.js/Beginner API/app.js

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+const express = require('express');
+const app = express();
+
+app.listen(3000, () => console.log('Server started successfully!'));
+app.use(express.json());
+
+// cd into the Node.js\APIs\Express.js\Beginner folder, and run 'npm install', then 'npm start' to start the server!
+
+// Simple GET endpoint
+app.get('/users', (req, res) => {
+    const userList = [
+        {name: 'Mike', age: 23},
+        {name: 'Jim', age: 41},
+        {name: 'Terra', age: 19},
+        {name: 'Richard', age: 32},
+        {name: 'Alex', age: 56},
+    ];
+
+    res.send(userList);
+    // GET localhost:3000/users = [{"name": "Mike", "age": 23}, {"name": "Jim", "age": 41},..]
+});
+
+// Simple POST endpoint
+app.post('/createUser', (req, res) => {
+    const userList = [
+        {name: 'Mike', age: 23},
+        {name: 'Jim', age: 41},
+        {name: 'Terra', age: 19},
+        {name: 'Richard', age: 32},
+        {name: 'Alex', age: 56},
+    ];
+
+    userList.push({name: req.body.name, age: req.body.age})
+
+    res.send(userList)
+    // POST localhost:3000/createUser using {"name": "Bob", "age": 44} to add him to the list!
+});
+

JavaScript/Node.js/Express.js/Beginner API/package.json

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+{
+  "name": "Beginner",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "start": "nodemon app.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.17.1",
+    "nodemon": "^1.19.3"
+  }
+}