With this module, you can manage local users by adding users and setting their passwords:

- name: Add local user to ESXi
  vmware_local_user_manager:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
    local_user_name: "myuser"
    local_user_password: "my-super-secret-password"
    local_user_description: "An example user added by Ansible"
  delegate_to: "localhost"