Update readme to include trust FAQs

[matthewcooper19]

Summary

What/Why

Add your summary here - keep it brief, to the point, and in plain English. For further information about pull requests, check out the GDS Way.

Your approach

Why did you choose this approach?

What to review

Include any helpful pointers for the reviewer.

Checklists

This pull/merge request meets the following requirements:

• [ ] code runs
• [ ] developments are ethical
• [ ] developments are secure (no data or notebook output)
• [ ] you have made proportionate checks that the code works correctly
• [ ] minimum usable documentation written in the docs folder

Comments have been added below around the incomplete checks.