param ([Parameter (Mandatory)]$DirName)

$NewDir = "$env:HOMEPATH\Documents\$DirName";

if (-not(Test-Path $NewDir)) {
    try {
        New-Item -ItemType Directory -Path $NewDir | Out-Null;
        Write-Output "Created directory $NewDir";
    }
    catch {
        Write-Output "Error creating $NewDir";
        Exit 102;
    }
}
else {
    Write-Output "Using existing directory $NewDir";
}

$NewFile = "$NewDir\NewStuff.txt";

New-Item -Path $NewFile -ItemType File -Force | Out-Null;
Add-Content -Path $NewFile -Value (Get-Date);
Add-Content -Path $NewFile -Value $env:USERNAME;
Add-Content -Path $NewFile -Value $MyInvocation.MyCommand.Name;

Write-Output "(Re)created $NewFile";
Get-Content $NewFile;