add Home.js

frontend/src/components/Home.js

@@ -0,0 +1,12 @@
+import React from 'react';
+
+function Home() {
+  return (
+    <div>
+      <h2>Welcome to the Invoice Notification App</h2>
+      <p>Use the navigation to view invoices and clients.</p>
+    </div>
+  );
+}
+
+export default Home;