add initial demo app

src/components/App.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import dynamic from "next/dynamic";
+
+const Demo = dynamic(() => import("./Demo"), {
+  ssr: false,
+});
+
+const WagmiConfig = dynamic(() => import("./WagmiProvider"), {
+  ssr: false,
+});
+
+export function App() {
+  return (
+    <WagmiConfig>
+      <Demo />
+    </WagmiConfig>
+  );
+}