add trademarking information

[orbeckst]

From MDAnalysis/mdanalysis-subprojects-branding#1 (comment) (@nicole-numfocus) (and updated to take into account that MDAnalysis is a registered trademark):

It would be good if you could add this line somewhere and also include the ® symbol with the logo.

"MDAnalysis® and the MDAnalysis logo are the sole property of NumFOCUS, Inc. (registration pending)."

Todo:

• update style guide with instructions (PR Update STYLE_GUIDE.md #12 )

(Note: MDAnalysis is a registered trademark so we use ® (R in circle) instead of ™ (trademark). See the updated Trademark section in the Style Guide.)

[orbeckst]

@nicole-numfocus I created this issue in our main branding repository as it is the central point for the core brand.

Could you please clarify the following?

With "also include the ™️ symbol with the logo." do you mean that the image files need to be changed so that the TM appears in the logo itself?

Can we do this while the registration is still pending or should we wait until it has been granted?

[orbeckst]

The trademark has been granted so we should be adding the TM to logo images.