Added fromJson, toJson

lib/data/dto/player.dart

@@ -10,4 +10,14 @@ class Player {
   String toString() {
     return 'Player{id: $id,name: $name}';
   }
+
+  /// Creates a Player instance from a JSON object.
+  Player.fromJson(Map<String, dynamic> json)
+    : id = json['id'],
+      name = json['name'];
+
+  /// Converts the Player instance to a JSON object.
+  String toJson() {
+    return 'Player{id: $id,name: $name}';
+  }
 }