add team

lib/data/dto/team.dart

@@ -0,0 +1,37 @@
+import 'package:clock/clock.dart';
+import 'package:game_tracker/data/dto/player.dart';
+import 'package:uuid/uuid.dart';
+
+class Team {
+  final String id;
+  final DateTime createdAt;
+  final List<Player> members;
+
+  Team({
+    String? id,
+    DateTime? createdAt,
+    required this.members,
+  }) : id = id ?? const Uuid().v4(),
+       createdAt = createdAt ?? clock.now();
+
+  @override
+  String toString() {
+    return 'Team{id: $id, members: $members}';
+  }
+
+  /// Creates a Team instance from a JSON object.
+  Team.fromJson(Map<String, dynamic> json)
+    : id = json['id'],
+      createdAt = DateTime.parse(json['createdAt']),
+      members = (json['members'] as List)
+          .map((memberJson) => Player.fromJson(memberJson))
+          .toList();
+
+  /// Converts the Team instance to a JSON object.
+  Map<String, dynamic> toJson() => {
+    'id': id,
+    'createdAt': createdAt.toIso8601String(),
+    'members': members.map((member) => member.toJson()).toList(),
+  };
+}
+