invoke-item: add page (#7517)

pages/windows/invoke-item.md

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+# Invoke-Item
+
+> Open files in their respective default programs.
+> This command can only be used through PowerShell.
+> More information: <https://docs.microsoft.com/powershell/module/microsoft.powershell.management/invoke-item>.
+
+- Open a file in its default program:
+
+`Invoke-Item -Path {{path/to/file}}`
+
+- Open all files inside a directory:
+
+`Invoke-Item -Path {{path/to/directory/*}}`
+
+- Open all PNGs inside a directory:
+
+`Invoke-Item -Path {{path/to/directory/*.png}}`
+
+- Open all files inside a directory containing a specific keyword:
+
+`Invoke-Item -Path {{path/to/directory/*}} -Include {{*keyword*}}`
+
+- Open all files inside a directory except those containing a specific keyword:
+
+`Invoke-Item -Path {{path/to/directory/*}} -Exclude {{*keyword*}}`
+
+- Perform a dry run to determine which files will be opened inside a directory through `Invoke-Item`:
+
+`Invoke-Item -Path {{path/to/directory/*}} -WhatIf`