I disagree with you russian-dima, stored passwords in plain text does NOT mean that they’re insecure, you can set the collection access only for Admins, and check the passwords on the Backend , and only return approved or disapproved status to the Frontend , pretty mush how Wix handles the login process, except that the passwords aren’t stored in a collection that you can access, but a collection that they - might - have access to.
Good luck Peter 
And remember that you can always hire a developer to build it for you.