created models

lib/models/checklist.dart

@@ -0,0 +1,14 @@
+import 'listitem.dart';
+
+class Checklist {
+  final int id;
+  final String ownerId;
+  String title;
+  String description;
+  final DateTime createdTime;
+  List<Item> items;
+
+  Checklist(this.id, this.ownerId, this.title, this.description,
+      this.createdTime, List<Item>? items)
+      : items = items ?? [];
+}

lib/models/listitem.dart

@@ -0,0 +1,12 @@
+class Item {
+  final int id;
+  final String ownerId;
+  String title;
+  String description;
+  final DateTime createdTime;
+  List<String> checkedBy;
+
+  Item(this.id, this.ownerId, this.title, this.description, this.createdTime,
+      List<String>? checkedBy)
+      : checkedBy = checkedBy ?? [];
+}