code: public Observable<Person> createAsync(String personGroupId, CreatePersonGroupPersonsOptionalParameter createOptionalParameter) {
          return createWithServiceResponseAsync(personGroupId, createOptionalParameter).map(new Func1<ServiceResponse<Person>, Person>() {
              @Override
              public Person call(ServiceResponse<Person> response) {
                  return response.body();
              }
          });
      }
docs: Create a new person in a specified person group.
  
  @param personGroupId Id referencing a particular person group.
  @param createOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Person object