Creates or updates a user for the viewer.
username
The username being created or updated.
password
The password for the user being created or updated.
adminUsername
adminUsername.
adminPassword
adminPassword.
isAdmin
true if the user is admin; otherwise, false.
permissions
The user's permissions.
roles
The user's roles.
options
A CreateUserOptions object that specifies the options for this method.
A ControllerReturnCode value indicating the results of the call.