add server file

server.ts

@@ -0,0 +1,17 @@
+import { serve } from "bun";
+
+serve({
+  port: 3000,
+  fetch(req) {
+    const url = new URL(req.url);
+    let path = url.pathname;
+
+    if (path === "/") path = "/index.html";
+
+    const file = Bun.file(`./build${path}`);
+
+    return new Response(file);
+  },
+});
+
+console.log("Frontend listening on :3000");