merge from develop

Tsi1.Api/Tsi1.BusinessLayer/Dtos/TenantCourseDto.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Tsi1.BusinessLayer.Dtos
+{
+    public class TenantCourseDto
+    {
+        public TenantCourseDto()
+        {
+            Courses = new List<CoursePreviewDto>();
+        }
+
+        public int Id { get; set; }
+
+        public string Name { get; set; }
+
+        public List<CoursePreviewDto> Courses { get; set; }
+    }
+}