Update README.md

[ojopiyo]

Improvements / Safety Features

1. Error Handling - The try/catch block ensures the script reports errors instead of failing silently.
2. Check for Existing URL - Prevents overwriting a folder or list that already exists at the target URL.
3. Updates List Object Directly - Set-PnPList -Identity $list avoids confusion after moving the folder.
4. Informative Output - Write-Host shows clear messages on success or failure.