Where to start ASP.NET framework 4.6.1 for universal login


I have a working production version of web application.
We have our user and authentication table, but we want to enable our user to login via their google or microsoft email account, therefore we want to seek a solution like Auth0.

I am using visual studio, what nuget should I download to start accepting Auth0 credential?
I am not sure what where to start, I am thinking of using universal login

Thank you for your wisdom, I really appreciate it.