Configuration MyDSC
{
    param
    (
        [Parameter()]$Password
    )


    Node localhost
    {
        User MyUser
		{
            UserName = 'testman'
            Ensure = 'Present'
            Password = $Password
        }

    }
}

$configData = 'a'

$configData = @{
                AllNodes = @(
                              @{
                                 NodeName = 'localhost';
                                 PSDscAllowPlainTextPassword = $true
                                }
                    )
               }


MyDSC -Password (Get-Credential -UserName 'testman' -Message 'Enter New Password') -ConfigurationData $configData
 Start-DscConfiguration -ComputerName localhost -Wait -Force -Verbose -path .MyDSC