docs: add XML comments for messengers

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

@@ -3,29 +3,51 @@ using PepperDash.Essentials.Core;
 
 namespace PepperDash.Essentials.AppServer
 {
+    /// <summary>
+    /// Represents the content of a source selection message
+    /// </summary>
     public class SourceSelectMessageContent
     {
-
+        /// <summary>
+        /// Gets or sets the key of the source list item to select
+        /// </summary>
         [JsonProperty("sourceListItemKey")]
         public string SourceListItemKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the key of the source list containing the item
+        /// </summary>
         [JsonProperty("sourceListKey")]
         public string SourceListKey { get; set; }
     }
 
+    /// <summary>
+    /// Represents a direct routing operation between a source and destination
+    /// </summary>
     public class DirectRoute
     {
-
+        /// <summary>
+        /// Gets or sets the key of the source device
+        /// </summary>
         [JsonProperty("sourceKey")]
         public string SourceKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the key of the destination device
+        /// </summary>
         [JsonProperty("destinationKey")]
         public string DestinationKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the type of routing signal (Audio, Video, etc.)
+        /// </summary>
         [JsonProperty("signalType")]
         public eRoutingSignalType SignalType { get; set; }
     }
 
     /// <summary>
-    /// 
+    /// Delegate for press and hold actions with boolean state parameter
     /// </summary>
-    /// <param name="b"></param>
+    /// <param name="b">The state of the press and hold action</param>
     public delegate void PressAndHoldAction(bool b);
 }