Adding Sparkplug Brand Usage Handbook

-Add pdf version of this: https://docs.google.com/presentation/d/15FfQSmtJnXVwK4qf6KsZo6p4H8uyKroO3grGMiwyw_Y/edit#slide=id.ge435659d96_2_45

to: https://sparkplug.eclipse.org/compatibility/get-listed/ here:

Also pls delete this part highlighted:

@webdev