Starts creating the IMemberGroupService and supporting classes.

src/Umbraco.Core/Models/IMemberGroup.cs

@@ -7,6 +7,14 @@ namespace Umbraco.Core.Models
     /// </summary>
     public interface IMemberGroup : IAggregateRoot
     {
+        /// <summary>
+        /// The name of the member group
+        /// </summary>
         string Name { get; set; }
+
+        /// <summary>
+        /// Profile of the user who created this Entity
+        /// </summary>
+        int CreatorId { get; set; }
     }
 }