contact invitation accept notifications

lib/notifications/models/notifications_state.dart

@@ -0,0 +1,23 @@
+import 'package:fast_immutable_collections/fast_immutable_collections.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'notifications_state.freezed.dart';
+
+enum NotificationType {
+  info,
+  error,
+}
+
+@freezed
+class NotificationItem with _$NotificationItem {
+  const factory NotificationItem(
+      {required NotificationType type,
+      required String text,
+      String? title}) = _NotificationItem;
+}
+
+@freezed
+class NotificationsState with _$NotificationsState {
+  const factory NotificationsState({required IList<NotificationItem> queue}) =
+      _NotificationsState;
+}