//Post Url           {baseUrl}/api/Instructors
 //Request Headers    Content-Type:application/json
 //Request Body       {"Id":0, "Name":"Jon"}
 public Instructor Post(Instructor instructor)
 {
     var newId = _instructors.Count + 1;
     instructor.Id = newId;
     _instructors.Add(instructor);
     return instructor;
 }
 //Put Url            {baseUrl}/api/Instructors
 //Request Headers    Content-Type:application/json
 //Request Body       {"Id":1, "Name":"Jooooooooooo"}
 public Instructor Put(Instructor instructor)
 {
     var realinstructor = (from i in _instructors
                           where i.Id == instructor.Id
                           select i).FirstOrDefault();
     realinstructor.Name = instructor.Name;
     return instructor;
 }