Add PDA Ringtones (#5842)

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

Content.Server/PDA/Ringer/RingerComponent.cs

@@ -0,0 +1,27 @@
+using Content.Shared.PDA;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.PDA.Ringer
+{
+    [RegisterComponent, ComponentProtoName("Ringer")]
+    public sealed class RingerComponent : Component
+    {
+        [ViewVariables]
+        [DataField("ringtone")]
+        public Note[] Ringtone = new Note[SharedRingerSystem.RingtoneLength];
+
+        [DataField("timeElapsed")]
+        public float TimeElapsed = 0;
+
+        /// <summary>
+        /// Keeps track of how many notes have elapsed if the ringer component is playing.
+        /// </summary>
+        [DataField("noteCount")]
+        public int NoteCount = 0;
+
+        [DataField("isPlaying")]
+        public bool IsPlaying = false;
+    }
+}