I just installed the Colors plugin on my system and came to the realization that visitors to the site will not know how to add colors to texts and many might not even know how to use Markdown.
Now, I know that there is a link to Markdown at the bottom of the post editor, but I'll like to add some post editing/creation instructions specific to the site that are not part of Markdown. An example would be the feature that the Colors plugin brings to the table.
So here's the feature request, if it's doable: A Posting Guide or Help tab after the Preview tab that's essentially a static page that contains instructions on the basics of Markdown and optional features like adding colored text. It will, of course, be editable and created by the admin or publisher.