Finished out most of it

* Added most common HTML tags, along with descriptions and example.
* Added a style sheet to make it easy to delineate what's what.
* Added a short code. Now the entire style guide is movable and can be published anywhere. I also don't need to delete the page and reload the plugin in order to reflect new changes. This was especially annoying for minor edits.
* Added a test picture for the image related items
* Added the config.php file for constants.

Signed-off-by: Chris Wilcoxson <chris@slushman.com>