adding line for uninstall ai shell

Author: StevenBucher98

reference/docs-conceptual/AIShell/install-aishell.md

@@ -66,6 +66,12 @@ On macOS, this script:
 Invoke-Expression "& { $(Invoke-RestMethod 'https://aka.ms/install-aishell.ps1') }"
 ```
 
+To uninstall AI Shell you can just add the `-Uninstall` parameter in the invoke expression statement like below.
+
+```powershell
+Invoke-Expression "& { $(Invoke-RestMethod 'https://aka.ms/install-aishell.ps1') } -Uninstall"
+```
+
 To manually install AI Shell, follow the instructions for your platform:
 
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