created basic backend, with simple routes

src/routes/index.js

@@ -0,0 +1,14 @@
+const express = require('express');
+const router = express.Router();
+
+// Routes
+router.get('/', (req, res) => {
+  res.json({ message: 'Welcome to the Express backend!' });
+});
+
+// Example route
+router.get('/api/hello', (req, res) => {
+  res.json({ message: 'Hello from the backend!' });
+});
+
+module.exports = router;