public Person Create(PersonAddOptions options)
 {
     var entity = new Person
     {
         Id = _nextId++,
         First = options.First,
         Last = options.Last
     };
     _people.Add(entity);
     JsonFileToList<Person>.Write(_filename, _people);
     return entity;
 }
 public IHttpActionResult Post(PersonAddOptions options)
 {
     var vm = _peopleRepository.Create(options);
     return Ok(vm);
 }