Introduce relevant content from NIST-800-63C

[indrajit-gsa]

This issue will incorporate any relevant content and diagrams from NIST-800-63C - Digital Identity Guidelines on Federation and Assertions.

[indrajit-gsa]

Here are some relevant information for the federation playbook.

• Federation Protocols & Technologies: NIST SP 800-63C - Section 11 Examples - Introduces SAML, OIDC and Kerberos. Should we add PKI as well from roadmap?
• Federation Assurance Levels: NIST SP 800-63C - Section 4 - Guidance on the FAL. Should we introduce IAL and AAL? How about the 4 LOAs?
• Assertions: NIST SP 800-63C - Section 5, 6 and 7 - Provide some information on assertion (1 page). The Fig 7-1 and 7-2 can be used as visuals.
• Usability: NIST SP 800-63C - Section 10 Usability Considerations - Good summary of the usability guidelines.

Other content that may be useful are:

• Security - NIST SP 800-63C - section 8 - security considerations.
• Privacy - NIST SP 800-63C - section 9 - privacy considerations.