featr: Add PresenterTrackMode enum to IPresenterTrack.cs

Introduces a new enumeration `PresenterTrackMode` that defines four tracking modes for the Cisco codec's Presenter Track feature: `Off`, `Follow`, `Background`, and `Persistent`. Each mode includes a summary comment for clarity.

src/PepperDash.Essentials.Devices.Common/Codec/Cisco/IPresenterTrack.cs

@@ -8,6 +8,30 @@ using System.Threading.Tasks;
 
 namespace PepperDash.Essentials.Devices.Common.Codec.Cisco
 {
+    /// <summary>
+    /// Describes the available tracking modes for a Cisco codec's Presenter Track feature.
+    /// </summary>
+    public enum PresenterTrackMode
+    {
+        /// <summary>
+        /// Presenter Track is turned off.
+        /// </summary>
+        Off,
+        /// <summary>
+        /// Presenter Track follows the speaker's movements.
+        /// </summary>
+        Follow,
+        /// <summary>
+        /// Presenter Track is set to background mode, where it tracks the speaker but does not actively follow.
+        /// </summary>
+        Background,
+        /// <summary>
+        /// Presenter Track is set to persistent mode, where it maintains a fixed position or focus on the speaker.
+        /// </summary>
+        Persistent
+    }
+
+
     /// <summary>
     /// Describes the Presenter Track controls for a Cisco codec.
     /// </summary>