✨ Add express backend server

server/index.js

@@ -0,0 +1,11 @@
+import express from "express";
+const app = express();
+const port = process.send.PORT || 3000;
+
+app.get("/", (req, res) => {
+  res.send("Hello World!");
+});
+
+app.listen(port, () => {
+  console.log(`Server listening on http://localhost:${port}`);
+});