Create a file with a content.
        :param path: the path of the file.
        :type path: str
        :param content: the content of the file
        :type content: str
        :param mode: the mode of the file while opening it
        :type mode: str

def create_file(self, path, content, mode='w'):
        """Create a file with a content.
        :param path: the path of the file.
        :type path: str
        :param content: the content of the file
        :type content: str
        :param mode: the mode of the file while opening it
        :type mode: str
        """
        self._check_started()
        sftp = paramiko.SFTPClient.from_transport(self._transport)
        with sftp.open(path, mode) as remote_file:
            remote_file.write(content)
            remote_file.flush()