code: public List<Row> addRows(long sheetId, List<Row> rows) throws SmartsheetException {
          return this.postAndReceiveList("sheets/" + sheetId + "/rows", rows, Row.class);
      }
docs: Insert rows to a sheet.
  
  It mirrors to the following Smartsheet REST API method: POST /sheets/{sheetId}/rows
  
  Exceptions:
  - IllegalArgumentException : if any argument is null
  - InvalidRequestException : if there is any problem with the REST API request
  - AuthorizationException : if there is any problem with the REST API authorization(access token)
  - ResourceNotFoundException : if the resource can not be found
  - ServiceUnavailableException : if the REST API service is not available (possibly due to rate limiting)
  - SmartsheetRestException : if there is any other REST API related error occurred during the operation
  - SmartsheetException : if there is any other error occurred during the operation
  
  @param sheetId the sheet id
  @param rows the list of rows to create
  @return the created rows
  @throws SmartsheetException the smartsheet exception