New: Added column in Queue

(cherry picked from commit 57445bbe57a84990e284ef97d42455a06587e1ee)

Closes #9621

src/NzbDrone.Core/Queue/Queue.cs

@@ -20,6 +20,7 @@ namespace NzbDrone.Core.Queue
         public decimal Sizeleft { get; set; }
         public TimeSpan? Timeleft { get; set; }
         public DateTime? EstimatedCompletionTime { get; set; }
+        public DateTime? Added { get; set; }
         public string Status { get; set; }
         public TrackedDownloadStatus? TrackedDownloadStatus { get; set; }
         public TrackedDownloadState? TrackedDownloadState { get; set; }