Docs for creating and confirming a user?

I'd be happy to write up what I've managed to get working for allowing a user to sign up and confirm a new account. Just wanted to check if you'd be open to a PR that adds that documentation. If so, would you prefer it just be added to the `README` or something else?

Start by reviewing the README and the existing user sign-up and account-confirmation guidance in the repository. Confirm the preferred documentation location and scope from the issue discussion, then document the working flow for creating and confirming a user; done means the steps are available in the agreed location.

Written by the indexing model from the issue text.