fix: add IStateFeedback interface

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IStateFeedback.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace PepperDash.Essentials.Core.DeviceTypeInterfaces
+{
+
+  /// <summary>
+  /// Interface for devices that provide audio meter feedback.
+  /// This interface is used to standardize access to meter feedback across different devices.
+  /// </summary>
+  public interface IStateFeedback
+  {
+    /// <summary>
+    /// Gets the state feedback for the device.
+    /// This property provides a BoolFeedback that represents the current state (on/off) of the device.
+    /// </summary>
+    BoolFeedback StateFeedback { get; }
+  }
+}