from tasks/main.yml
- name: add admin accounts
  user: name={{ item.name }} groups=sudo,adm password={{ item.passwd }} shell=/bin/bash append=yes
  with_items: "{{ sudo_users }}"

from vars/main.yml
sudo_users:
   - { name: user1, key: " {{ lookup('file', 'user1.pub') }} " , passwd: "$1$KE5KSXsaltedpass" }
   - { name: user2, key: " {{ lookup('file', 'user2.pub') }} " , passwd: "$1$someothersalt/" }