private static void LoadEntities(Assembly asm, DbModelBuilder modelBuilder, string nameSpace)
        {
            var entityTypes = asm.GetTypes()
                .Where(type => type.BaseType != null &&
                               type.Namespace == nameSpace &&
                               type.BaseType == null)
                .ToList();

            entityTypes.ForEach(modelBuilder.RegisterEntityType);
        }

Add-Migration Initial -IgnoreChanges