Restructured query repositries to move ef logic from handlers

BrightGlimmer.Service/Queries/GetStudentsQuery.cs

@@ -0,0 +1,10 @@
+using BrightGlimmer.Domain;
+using MediatR;
+using System.Collections.Generic;
+
+namespace BrightGlimmer.Service.Queries
+{
+    public class GetStudentsQuery : IRequest<IEnumerable<Student>>
+    {
+    }
+}