code: public Observable<ServiceResponse<ImageList>> createWithServiceResponseAsync(String contentType, BodyModel bodyParameter) {
          if (this.client.baseUrl() == null) {
              throw new IllegalArgumentException("Parameter this.client.baseUrl() is required and cannot be null.");
          }
          if (contentType == null) {
              throw new IllegalArgumentException("Parameter contentType is required and cannot be null.");
          }
          if (bodyParameter == null) {
              throw new IllegalArgumentException("Parameter bodyParameter is required and cannot be null.");
          }
          Validator.validate(bodyParameter);
          String parameterizedHost = Joiner.on(", ").join("{baseUrl}", this.client.baseUrl());
          return service.create(contentType, bodyParameter, this.client.acceptLanguage(), parameterizedHost, this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<ImageList>>>() {
                  @Override
                  public Observable<ServiceResponse<ImageList>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<ImageList> clientResponse = createDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Creates an image list.
  
  @param contentType The content type.
  @param bodyParameter Schema of the body.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ImageList object