Add PDA Ringtones (#5842)

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

Content.Shared/PDA/Ringer/RingerMessagesUI.cs

@@ -0,0 +1,24 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using System;
+
+namespace Content.Shared.PDA.Ringer
+{
+
+    [Serializable, NetSerializable]
+    public sealed class RingerRequestUpdateInterfaceMessage : BoundUserInterfaceMessage {}
+
+    [Serializable, NetSerializable]
+    public sealed class RingerPlayRingtoneMessage : BoundUserInterfaceMessage {}
+
+    [Serializable, NetSerializable]
+    public sealed class RingerSetRingtoneMessage : BoundUserInterfaceMessage
+    {
+        public Note[] Ringtone {get;}
+
+        public RingerSetRingtoneMessage(Note[] ringTone)
+        {
+            Ringtone = ringTone;
+        }
+    }
+}