add calendar option for digital signs feed

BeckmanComms.Api.DataTransferObjects/V2/Events/BeckmanCalendars.cs

@@ -35,6 +35,12 @@ namespace BeckmanComms.Api.DataTransferObjects.V2.Events
         /// MSL calendar.
         /// </summary>
         [Description("Calendar for the Memory Systems Lab (MSL) at the Beckman Institute.")]
-        MslEvents = 4470
+        MslEvents = 4470,
+
+        /// <summary>
+        /// Beckman digital signs calendar feed.
+        /// </summary>
+        [Description("Beckman Institute calendar for use on in-house digital signs. Contains non-general-interest events.")]
+        BeckmanInstituteDigitalSigns = -1
     }
 }
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