create MergeSortPage

Author: AhmedAbdoElhawary

lib/features/sorting/merge/view/merge_sort_page.dart

@@ -0,0 +1,30 @@
+import 'package:algorithm_visualizer/core/resources/strings_manager.dart';
+import 'package:algorithm_visualizer/features/sorting/base/view/sorting_page.dart';
+import 'package:algorithm_visualizer/features/sorting/base/view_model/sorting_notifier.dart';
+import 'package:algorithm_visualizer/features/sorting/merge/view_model/merge_sort_notifier.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final _notifierProvider = StateNotifierProvider<SortingNotifier, SortingNotifierState>(
+  (ref) => MergeSortNotifier(),
+);
+
+class MergeSortPage extends ConsumerStatefulWidget {
+  const MergeSortPage({super.key});
+
+  @override
+  ConsumerState<MergeSortPage> createState() => _MergeSortPageState();
+}
+
+class _MergeSortPageState extends ConsumerState<MergeSortPage> {
+  @override
+  void deactivate() {
+    ref.invalidate(_notifierProvider); // deletes current instance and resets
+    super.deactivate();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return SortingPage(instance: _notifierProvider, title: StringsManager.mergeSort);
+  }
+}