Add PDA Ringtones (#5842)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/PDA/Ringer/RingerUpdateState.cs

@@ -0,0 +1,20 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using System;
+
+namespace Content.Shared.PDA.Ringer
+{
+    [Serializable, NetSerializable]
+    public sealed class RingerUpdateState : BoundUserInterfaceState
+    {
+        public bool IsPlaying;
+        public Note[] Ringtone;
+
+        public RingerUpdateState(bool isPlay, Note[] ringtone)
+        {
+            IsPlaying = isPlay;
+            Ringtone = ringtone;
+        }
+    }
+
+}