Can I create an User Account from code

You can use the Create method of the Security.Users class to do that. Bear in mind that class is in %SYS. Documentation for Create is here: Security.Users.

set$nameSpace = "%SYS"if '##class(Security.Users).Exists("testuser") {
    // Set propertiesset props("Enabled")=1set props("Name")=testuser
    set props("FullName")="Test User"set props("SuperUser")=0set props("NameSpace")="USER"set props("Roles")="%Developer,%Operator,TestRole"set props("Password")=userpassword
    set props("PasswordNeverExpires")=0set props("ChangePassword")=0set props("Routine")=""set props("ExpirationDate")=""set props("Flags")=1set props("EmailAddress")=""set status=##class(Security.Users).Create(user, .props)
    if$$$ISERR(status) {
        do$system.Status.DecomposeStatus(status, .err)
    }
}