https://damienbod.com/2019/08/06/asp-net-core-identity-with-fido2-webauthn-mfa/
2019-10-18 Added example for FIDO2 passwordless
2019-10-07 Updated to .NET Core 3.0
2019-09-20 Updated to .NET Core 3.0 rc1
2019-09-06 Updated to .NET Core 3.0 preview 9
2019-08-13 Updated to .NET Core 3.0 preview 8
https://github.com/abergs/fido2-net-lib
https://www.youtube.com/watch?v=qgZ3JO2khFg
https://www.yubico.com/products/yubikey-hardware/
https://www.youtube.com/watch?v=2KfZJRsacNM
https://www.troyhunt.com/beyond-passwords-2fa-u2f-and-google-advanced-protection/
https://fidoalliance.org/fido2/
https://www.w3.org/TR/webauthn/
https://www.scottbrady91.com/FIDO/A-FIDO2-Primer-and-Proof-of-Concept-using-ASPNET-Core
https://github.com/herrjemand/awesome-webauthn
https://developers.yubico.com/FIDO2/Libraries/Using_a_library.html