Add barebone nuke (#5242)

Co-authored-by: Alexander Evgrashin <evgrashin.adl@gmail.com>

Content.Shared/Nuke/SharedNuke.cs

@@ -0,0 +1,32 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Nuke
+{
+    [Serializable, NetSerializable]
+    public enum NukeUiKey : byte
+    {
+        Key
+    }
+
+    public enum NukeStatus : byte
+    {
+        AWAIT_DISK,
+        AWAIT_CODE,
+        AWAIT_ARM,
+        ARMED
+    }
+
+    [Serializable, NetSerializable]
+    public class NukeUiState : BoundUserInterfaceState
+    {
+        public bool DiskInserted;
+        public NukeStatus Status;
+        public int RemainingTime;
+        public bool IsAnchored;
+        public int EnteredCodeLength;
+        public int MaxCodeLength;
+        public bool AllowArm;
+    }
+}