@staticmethod
def read_file(file_name):
    """Read a Markdown file using a file name. It is not necessary to add *.md extension.

        :param file_name: Markdown file's name.
        :type file_name: str
        :return: return all file's data.
        :rtype: str"""
    if file_name.find('.md') == -1:
        file_name += '.md'
    with open(file_name, 'r', encoding='utf-8') as file:
        file_data = file.read()
    return file_data
