dotnet new classlib --name psmodule
cd psmodule
dotnet add package PowerShellStandard.Library --version 3.0.0-preview-01
Remove-Item .\Class1.cs
@'
using System.Management.Automation;

namespace PSCmdlet3
{
    [Cmdlet("Get", "Foo")]
    public class GetFooCommand : PSCmdlet
    {
        [Parameter]
        public string Name { get; set; } = string.Empty;

        protected override void EndProcessing()
        {
            this.WriteObject("Foo is " + this.Name);
            base.EndProcessing();
        }
    }
}
'@ | Out-File GetFooCommand.cs -Encoding UTF8
dotnet build
cd .\bin\Debug\netstandard2.0\
ipmo .\psmodule.dll
get-foo

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      5.1.15063.608
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.15063.608
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

PSRemotingProtocolVersion      2.3