Create research brief for testing Elements component docs

[amyhupe]

What

Write a user research brief to outline the type and purpose of the research we're planning in January to test our component documentation.

Why

To make sure we have a clear set of goals and can start recruiting participants.

Done when

• [x] Brief is drafted
• [x] Reviewed and approved by James

Anything else

Research brief template

[amyhupe]

Research brief created and checked by Research Ops lead and @foxintherain

https://docs.google.com/document/d/1vn8GcGsDgLcG5kREBjUhESDxXcxnmLIjbddv2UYz7nY/edit