def add(self, *args):
        """
        This function adds strings to the keyboard, while not exceeding row_width.
        E.g. ReplyKeyboardMarkup#add("A", "B", "C") yields the json result {keyboard: [["A"], ["B"], ["C"]]}
        when row_width is set to 1.
        When row_width is set to 2, the following is the result of this function: {keyboard: [["A", "B"], ["C"]]}
        See https://core.telegram.org/bots/api#replykeyboardmarkup
        :param args: KeyboardButton to append to the keyboard
        """
        i = 1
        row = []
        for button in args:
            row.append(button.to_dic())
            if i % self.row_width == 0:
                self.keyboard.append(row)
                row = []
            i += 1
        if len(row) > 0:
            self.keyboard.append(row)