Summary of the new feature/enhancement

As a user I want PowerShell can exclude a folder and also exclude its subfolders and subfiles.

Proposed technical implementation details (optional)

For instance:

Get-ChildItem -Recurse -ExcludeFolderAndItsSubFolders "ExcludeFolder"

Then, the folder "ExcludeFolder" and all its subfolders and all files in it and its subfolders will be excluded.
"ExcludeFolderAndItsSubFolders " is only an example, it's a little long. Of course, you can choose any other better option name.