I would like for a site owner to have the option to check a box to add some supplemental CSS to a theme. This seems like it should be pretty easy, but I've not done it before.
I am assuming that I will need a config file for the theme.
I will need a config option to check "Yes" for supplemental stylesheet
I will need some code to add the css if the config is set to "yes."
Am I starting in the right place? Can anyone point me to some examples?