added settings page

lib/pages/settings_page.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/material.dart';
+
+class SettingsPage extends StatelessWidget {
+  static const routeName = '/settings';
+  const SettingsPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}