def setup(app):
app.info('<STR_LIT>')<EOL>app.add_role('<STR_LIT>', ghissue_role)<EOL>app.add_role('<STR_LIT>', ghissue_role)<EOL>app.add_role('<STR_LIT>', ghuser_role)<EOL>app.add_role('<STR_LIT>', ghcommit_role)<EOL>app.add_config_value('<STR_LIT>', None, '<STR_LIT>')<EOL>return<EOL>
Install the plugin.

    :param app: Sphinx application context.