refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Devices.Common/Codec/iCodecAudio.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+using PepperDash.Essentials.Core;
+
+namespace PepperDash.Essentials.Devices.Common.Codec
+{
+    /// <summary>
+    /// Defines minimum volume controls for a codec device with dialing capabilities
+    /// </summary>
+    public interface ICodecAudio : IBasicVolumeWithFeedback, IPrivacy
+    {
+
+    }
+}