Create a list of users that can access my community without invite

Hi community,

I want to create a list of users that is automatically registered in the community and does not need to receive an invitation email.

The problem is: we will put the community in our app but without the SSO (in the first moment), we want an experience that the client automatically can access the community through the app without receive an invite email or try to register and wait to be approved. Is it possible?