chore: move classes and interfaces to individual files

src/PepperDash.Essentials.MobileControl.Messengers/Messengers/DeviceStateMessageBase.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+  /// <summary>
+  /// Represents a DeviceStateMessageBase
+  /// </summary>
+  public class DeviceStateMessageBase : DeviceMessageBase
+  {
+    /// <summary>
+    /// The interfaces implmented by the device sending the messsage
+    /// </summary>
+    [JsonProperty("interfaces")]
+    public List<string> Interfaces { get; private set; }
+
+    /// <summary>
+    /// Sets the interfaces implemented by the device sending the message
+    /// </summary>
+    /// <param name="interfaces"></param>
+    public void SetInterfaces(List<string> interfaces)
+    {
+      Interfaces = interfaces;
+    }
+  }
+
+}