Add config for custom response to create command

[Techtony96]

Add a configuration option to allow a custom response to the create command.

The default (as it stands today) could be represent as:

Token: `{token}`
Expires: {date}
Uses left: {uses}

This would allow users to add custom instructions, special wording/formatting for use by non-admins, and most importantly, format in a way a user can click on to pre-fill the token into the registration form.

For Cinny, this would look like: https://app.custom.domain/register/https%3A%2F%2Fcustom.domain?token={token}