add opengraph image + embed

src/app/opengraph-image.tsx

@@ -0,0 +1,22 @@
+import { ImageResponse } from "next/og";
+
+export const alt = "Farcaster Frames V2 Demo";
+export const size = {
+  width: 800,
+  height: 800,
+};
+
+export const contentType = "image/png";
+
+export default async function Image() {
+  return new ImageResponse(
+    (
+      <div tw="h-full w-full flex flex-col justify-center items-center relative">
+        <h1 tw="text-6xl">Frames v2 Demo</h1>
+      </div>
+    ),
+    {
+      ...size,
+    }
+  );
+}