Add [clef_render_login_button] shortcode use notes to the WordPress plugin directory entry

[sandieann]

I remembered seeing this added on the changelog (it was added in 2.1.1 it seems), but that doesn't detail the actual code to use and you don't seem to have added the information to any of the other directory pages. I suggest that typically we might expect to see shortcode information on the installation and/or faq pages, perhaps a mention of it on the main intro. page? Might as well shout about ease of use, some potential end-users probably won't notice otherwise.

[lolux]

Thanks @sandiehughes . This is now on my task list and should be finished in a few days.