Add XML documentation across gateway, worker, and .NET client

src/MxGateway.Worker/MxAccess/MxAccessEventQueueOverflowException.cs

@@ -4,11 +4,18 @@ namespace MxGateway.Worker.MxAccess;
 
 public sealed class MxAccessEventQueueOverflowException : Exception
 {
+    /// <summary>
+    /// Initializes a new instance of <see cref="MxAccessEventQueueOverflowException"/>.
+    /// </summary>
+    /// <param name="capacity">Queue capacity.</param>
     public MxAccessEventQueueOverflowException(int capacity)
         : base($"MXAccess outbound event queue reached its configured capacity of {capacity}.")
     {
         Capacity = capacity;
     }
 
+    /// <summary>
+    /// Gets the queue capacity.
+    /// </summary>
     public int Capacity { get; }
 }