add support for XWebinarGroupEntity and it's InMemory Repository and also Register it's required Services and usage in WebinarHub ...

Interfaces/IXWebinarGroupStore.cs

@@ -0,0 +1,11 @@
+using System;
+using xDataService.Interfaces;
+using xWebinarService.Models.Entities;
+
+namespace xWebinarService.Interfaces
+{
+    public interface IXWebinarGroupStore : IXBaseRepository<XWebinarGroupEntity, Guid>
+    {
+        
+    }
+}