first commit

NitroxServer/GameLogic/Players/PlayerData.cs

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+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+
+namespace NitroxServer.GameLogic.Players
+{
+    [DataContract]
+    public class PlayerData
+    {
+        [DataMember(Order = 1)]
+        public List<PersistedPlayerData> Players = [];
+
+        public List<Player> GetPlayers()
+        {
+            return Players.Select(playerData => playerData.ToPlayer()).ToList();
+        }
+
+        public static PlayerData From(IEnumerable<Player> players)
+        {
+            List<PersistedPlayerData> persistedPlayers = players.Select(PersistedPlayerData.FromPlayer).ToList();
+
+            return new PlayerData { Players = persistedPlayers };
+        }
+    }
+}