added frontend

hartmann-foto-documentation-frontend/lib/pages/customer/customer_widget.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+class CustomerWidget extends StatefulWidget {
+  const CustomerWidget({super.key});
+
+  @override
+  State<CustomerWidget> createState() => _CustomerWidgetState();
+}
+
+class _CustomerWidgetState extends State<CustomerWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}