@staticmethod<EOL><INDENT>def add_arguments(parser):<DEDENT>
pass<EOL>
Subclasses may implement this method to add their own arguments to
the hotdoc binary.

In this function, you should add an argument group to the passed-in
parser, corresponding to your extension.
You can then add arguments to that argument group.

Example::

    @staticmethod
    def add_arguments(parser):
        group = parser.add_argument_group('Chilidoc',
            'Delicious Hotdoc extension')
        Chilidoc.add_sources_argument(group)
        group.add_argument('--chili-spicy', action='store_true',
            help='Whether to add extra pepper')

Args:
    parser (argparse.ArgumentParser): Main hotdoc argument parser