I want to add a splash new template page announcing that my site is currently undergoing maintenance, but where precisely do I create that page? Nothing I've read so far tells me.
I don't want to add a page in the administration panel because that would contain my sidebar. And I want just text and maybe a photo in it. (Don't want to use a plugin).
And there's no place in the theme editor to add a new template page, so is it created in a text editor or exactly where?
Thanks very much for some guidance here.