* finished #6925
* augmented per @BrennanConroy
* fixed css link
* added method to hub
* added code from sample to file
* fixed user sample
* removed the email version of this sample
* removed last mention of the customization
* Minor edits
* added (and tested) claimtypes.email-supporting identity approach
* referencing code in sample instead of hard-typed
* fixed a dumb thing
* implemented all changes suggested by @tdykstra
* fixed suggestions from @scottaddie
* updated metadata
* Update ms.date
* tweaks implemented per @BrennanConroy
* Update heading
* initial prose, samples still todo
* add sample and docs on Windows Auth
* add sample download link
* fix some code samples
* fix xref
* clarify sample comment when it's embedded in the document
* pr feedback
* add section on buffer management
* feedback
* some feedback
* update index/toc
* Update authn-and-authz.md
Rick Anderson
Andrew Stanton-Nurse
Brady Gaster