Draft: Write documentation for knowledgebase, peopledepot, Cognito user sign up flow

### Overview

How this will work needs to be identified.
- If you want to use APIs written for Knowledgebase and don't want to give access to KB admin screens:
- log into People Developer through Cognito
- sign up for Cognito user account
- assign user kb_api_user to user
- If you want to use Django admin screens in KB as well as access to PD KB oriented API(s)
- log into People Depot through Cognito:
- sign up for Cognito user account
- assign user kb_admin or kb_view
- log into KB using same kb_account

### Screen Shots
Page with button to log in through Cognito from KB

Sign up in Cognito

Knowledgebase Welcome Screen

Screen shot with no users in PD