[AB-xxx] initial experience leaderboard version

ui/experience-tracking/src/components/ErrorDisplay.tsx

@@ -0,0 +1,8 @@
+
+export const ErrorDisplay = () => {
+    return (
+        <>
+            <h1 className="mb-4 text-4xl font-extrabold leading-none tracking-tight md:text-5xl lg:text-6xl text-white">Failed to load leaderboard</h1>
+        </>
+    );
+}