cluster.yaml

---
profile::base::localaccounts::groups:
  Administrators:
    members:
      - mydomain\myuser

localaccounts.pp

# profile::base::localaccounts
class profile::base::localaccounts (
  Boolean $manage = true,
  Hash    $groups = {},
  Hash    $users  = {},
) {

  if ($manage) {
    $groups.each | String $group, Hash $attributes | {
      group { $group:
        * => $attributes,
      }
    }

    $users.each | String $user, Hash $attributes | {
      user { $user:
        * => $attributes,
      }
    }
  }

}