chapter 5: add initial samples

Chapter05/ecmascript-modules/server.mjs

@@ -0,0 +1,11 @@
+import express from 'express'
+import { name } from './get-name/index.mjs'
+
+const PORT = 3000;
+const app = express();
+
+app.get('/', (req, res) => res.send(`Hello from ${name}!`))
+
+app.listen(PORT, () => {
+    console.log("Express server started on port", PORT);
+})