* stub for custom providers doc
* progress
* more progress
* Updating TKey references.
* More progress
* adding sample project with default identity controllers and views
* Final updates before PR
* Update identity-custom-storage-providers.md (#3509)
* Update identity-custom-storage-providers.md
* Update identity-custom-storage-providers.md
* Minor tweaks to Identity storage providers doc
* Change "a" to "an"
* Update identity-custom-storage-providers.md
* Responding to Tom's feedback in Rick's PR.
* Responding to feedback
* Updated home page to provide instructions. Updated ApplicationUser to implement IIdentity.
Steve Smith