[New Feature] Add a notice about how to use the plugin for theme reviews

[carolinan]

Is your feature request related to a problem? Please describe.
Theme reviewers copy and paste the results in the themes Trac and think the review is complete.

Describe the solution you'd like
A clear and concise description of how to use the results in reviews.

[dingo-d]

Where should we document this usage? In the plugin readme? On the Github? Somewhere on the TRT make blog?