first commit

NitroxModel/DataStructures/GameLogic/Entities/Metadata/KeypadMetadata.cs

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+using System;
+using System.Runtime.Serialization;
+using BinaryPack.Attributes;
+
+namespace NitroxModel.DataStructures.GameLogic.Entities.Metadata
+{
+    [Serializable]
+    [DataContract]
+    public class KeypadMetadata : EntityMetadata
+    {
+        [DataMember(Order = 1)]
+        public bool Unlocked { get; }
+
+        [IgnoreConstructor]
+        protected KeypadMetadata()
+        {
+            // Constructor for serialization. Has to be "protected" for json serialization.
+        }
+
+        public KeypadMetadata(bool unlocked)
+        {
+            Unlocked = unlocked;
+        }
+
+        public override string ToString()
+        {
+            return $"[KeypadMetadata isOpen: {Unlocked}]";
+        }
+    }
+}