Reports - Add Users activities

MediaBrowser.Api/Reports/Common/HeaderActivitiesMetadata.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Api.Reports
+{
+    public enum HeaderActivitiesMetadata
+	{
+        None,
+        Name,
+        Overview,
+        ShortOverview,
+        Type,
+        Date,
+        UserPrimaryImageTag,
+        Severity,
+        Item,
+        User
+	}
+}