Add middleware to trigger on accessing root

examples/nextjs-14-app-dir-rl/middleware.ts

@@ -0,0 +1,10 @@
+import { createMiddleware, rateLimit } from "@arcjet/next";
+export const config = {
+  // matcher tells Next.js which routes to run the middleware on
+  matcher: ["/"],
+};
+const middleware = createMiddleware({
+  key: "ajkey_yourkey",
+  rules: [],
+});
+export default middleware;