Set up authorized_keys for purely new machine.

Hello community,
I’m at very beginning of ansible understanding for now. And main goal is to get proper keys for set of users on a new server. And work in normal mode after.
Given: some server which have password ssh access for root (or sudoer like azureuser for Microsoft Azure).
Goal: setup ~/.ssh/authorized_keys for set of users e.g. root, azureuser, deploy.
Problem: How to run particular task with prompted user and prompted password.

Now I have a file with just one plain task: