Final added TOTP 2FA (#2557)
Final added TOTP 2FA (#2557)

* Final added TOTP 2FA

https://getfinal.com/company-news/2017/05/31/why-final-is-transitioning-to-TOTP-for-2FA/

* add doc link

bjorno/twofactorauth,seitsu/twofactorauth,jdavis/twofactorauth,bjorno/twofactorauth,vgarmash/twofactorauth,Nitrokey/dongleauth,cez81/twofactorauth,Nitrokey/dongleauth,rugk/twofactorauth,cez81/twofactorauth,rugk/twofactorauth,Jawshy/twofactorauth,bceasydns/twofactorauth,vgarmash/twofactorauth,seitsu/twofactorauth,rj175/twofactorauth,jdavis/twofactorauth,RichJeanes/twofactorauth,bceasydns/twofactorauth,seitsu/twofactorauth,Jawshy/twofactorauth,cez81/twofactorauth,brierjon/twofactorauth,brierjon/twofactorauth,Nitrokey/dongleauth,rj175/twofactorauth,bceasydns/twofactorauth,rugk/twofactorauth,RichJeanes/twofactorauth,NormandLemay/twofactorauth,bjorno/twofactorauth,jdavis/twofactorauth,NormandLemay/twofactorauth,RichJeanes/twofactorauth,Jawshy/twofactorauth,Jawshy/twofactorauth,vgarmash/twofactorauth,NormandLemay/twofactorauth,brierjon/twofactorauth,rj175/twofactorauth