Adding server.js template file

server.js

+const express = require('express');
+const app = express();
+
+// Basic route for testing
+app.get('/', (req, res) => {
+  res.send('Server is running!');
+});
+
+// Start the server
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});