Add PowerShell command to get large files

src/powershell.md

@@ -6,6 +6,11 @@ List all files with a particular extension in the current directory and its chil
 Get-ChildItem -Path .\ -Filter *.sln -Recurse -File | Select Fullname | Sort-Object Fullname
 ```
 
+List the 10 largest files in the current directory and subdirectories.
+```powershell
+gci -r | sort Length -desc | select @{n="Length";e={$_.length}}, fullname -f 10
+```
+
 Search Files.ps1
 ```powershell
 Get-ChildItem -Recurse -Include *.item | select-string "<term>"