[Openid-specs-mobile-profile] Issue #182: Support for NIST SP 800-63B AAL (openid/mobile)

[Bjorn Hjelm]

New issue 182: Support for NIST SP 800-63B AAL
https://bitbucket.org/openid/mobile/issues/182/support-for-nist-sp-800-63b-aal

Bjorn Hjelm:

In [NIST SP 800-63B](https://pages.nist.gov/800-63-3/sp800-63b.html), three levels of [Authentication Assurance Levels \(AALs\)](https://pages.nist.gov/800-63-3/sp800-63b.html#sec4) for authenticating a subscriber was introduced.  Deployments in the United States are using the NIST guidelines for deployments so should this be supported by the MODRNA Authentication Profile and added to [section 4](https://openid.net/specs/openid-connect-modrna-authentication-1_0.html#rfc.section.4)?

Responsible: John Bradley