Add project files.

Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using Serialization_Demo.Model;
+using System.Runtime.CompilerServices;
+using System.Text.Json;
+
+namespace Serialization_Demo
+{
+    class Program
+    {
+        private static List<Player> players = new List<Player>();
+        private static string filePath = "players.json";
+        static async Task Main(string[] args) // <-- HIER async Task Main
+        {
+            if (File.Exists(filePath))
+            {
+                players = await DeserializePlayersAsync(filePath); // <-- await
+                Console.WriteLine("Players loaded from file:");
+                foreach (var player in players)
+                {
+                    Console.WriteLine($"Name: {player.Name}, Score: {player.Score}");
+                }
+            }
+            else
+            {
+                players = new List<Player>
+                {
+                    new Player { Name = "Player 1", Score = 100 },
+                    new Player { Name = "Player 2", Score = 200 },
+                    new Player { Name = "Player 3", Score = 300 }
+                };
+
+                await SerializePlayersAsync(players, filePath); // <-- await
+                Console.WriteLine($"Players ({players.Count}) written to file");
+            }
+        }
+
+
+        private static async Task SerializePlayersAsync(List<Player> players, string filePath)
+        {
+            string json = JsonSerializer.Serialize(players);
+            await File.WriteAllTextAsync(filePath, json); // <-- async versie
+        }
+
+        private static async Task<List<Player>> DeserializePlayersAsync(string filePath)
+        {
+            string json = await File.ReadAllTextAsync(filePath); // <-- async versie
+            List<Player> players = JsonSerializer.Deserialize<List<Player>>(json);
+            return players ?? new List<Player>(); // kleine extra check
+        }
+    }
+}