Impementing toJson() and fromJson() Method in GameSession and Round class

lib/data/round.dart

@@ -1,3 +1,5 @@
+import 'package:cabo_counter/data/game_session.dart';
+
 /// This class represents a single round in the game.
 /// It is stored within the [GameSession] class.
 /// [roundNum] is the number of the round its reppresenting.
@@ -16,4 +18,19 @@ class Round {
       required this.scores,
       required this.scoreUpdates,
       this.kamikazePlayerIndex});
+
+  /// Converts the Round object to a JSON map.
+  Map<String, dynamic> toJson() => {
+        'roundNum': roundNum,
+        'scores': scores,
+        'scoreUpdates': scoreUpdates,
+        'kamikazePlayerIndex': kamikazePlayerIndex,
+      };
+
+  /// Creates a Round object from a JSON map.
+  Round.fromJson(Map<String, dynamic> json)
+      : roundNum = json['roundNum'],
+        scores = List<int>.from(json['scores']),
+        scoreUpdates = List<int>.from(json['scoreUpdates']),
+        kamikazePlayerIndex = json['kamikazePlayerIndex'];
 }