Update campaign handling

Hcs.WebApp/BackgroundServices/CampaignManagers/IManager.cs

@@ -2,6 +2,16 @@
 {
     public interface IManager
     {
+        public enum ManagerState
+        {
+            Created,
+            Started,
+            Working,
+            Ended
+        }
+
+        public ManagerState State { get; }
+
         Task StartAsync(CancellationToken cancellationToken);
     }
 }