Reference assemblies are needed for above example

[moerwald]

Enhancement: Mention that the user will need the "Microsoft.PowerShell.5.ReferenceAssemblies" NuGet package, to retrieve "System.Management.Automation"

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• ID: ba54a8a2-201d-e028-8d96-75494779fef3
• Version Independent ID: aedf2455-91de-433f-4680-a1da3cb0088b
• Content: How to Write a Simple Cmdlet
• Content Source: developer/cmdlet/how-to-write-a-simple-cmdlet.md
• Product: powershell
• Technology: powershell-developer
• GitHub Login: @joeyaiello
• Microsoft Alias: jaiello

[RansomVO]

Do this:

1. Right-click on References and select "Add Reference..."
2. On the bottom, click the "Browse..." button.
3. Navigate to "C:\Program Files (x86)\Reference Assemblies\Microsoft\WindowsPowerShell\3.0"
4. Select System.Management.Automation.dll and hit the "Add" button.
   (Refer to https://docs.microsoft.com/en-us/powershell/scripting/developer/installing-the-windows-powershell-sdk)