Documentation for Cloud Seed

What does this MR do and why?

Provides documentation for the initial set of private trusted testers.

Screenshots or screen recordings

TBD

How to set up and validate locally

Checkout branch, read docs.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.