create a password on the command line:
[jpork@titania ansible]$ openssl passwd -salt salty -1 nice-password
$1$salty$1iSO7pdZGKyvOSE/eE0eF.
use password in ansible:
tasks:
- name: Create user
user:
name: anyuser
password: $1$salty$v4L2MX2Z0/W7VwAuS1iJN/