Resolve "Configure MongoDB Connection"

Implemented connectDB, as described in #3 (closed); 1st commit introduced the check if connected to DB and make collections, 2nd commit made it fit the requirements and improved the code by adding error handling.

Closes #6 (closed)

mongodb.js

+const { MongoClient, Db } = require('mongodb');
+const url = 'mongodb://localhost:27017/todo';
+
+async function createCollections() {
+  	try {
+		const client = new MongoClient(url);
+		await client.connect();
+
+		// Check if the "todo" database exists and create it if not
+		const db = client.db('todo');
+		await db.createCollection('users'); // Check if collection "users" exists and create it if it doesn't exist
+		await db.createCollection('todos'); // Check if collection "todos" exists and create it if it doesn't exist
+		await db.createCollection('global'); // Check if collection "global" exists and create it if it doesn't exist
+
+		console.log('Collections created successfully!');
+		await client.close();
+	} catch (error) {
+		console.error('Error creating collections:', error);
+	}
+}
+
+createCollections();
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