Add code and package signing (#1895)

Build/Sign-Package.ps1

@@ -0,0 +1,26 @@
+
+$currentDirectory = split-path $MyInvocation.MyCommand.Definition
+
+# See if we have the ClientSecret available
+if([string]::IsNullOrEmpty($Env:SignClientSecret)){
+	Write-Host "Client Secret not found, not signing packages"
+	return;
+}
+
+dotnet tool install --tool-path . SignClient
+
+# Setup Variables we need to pass into the sign client tool
+
+$appSettings = "$currentDirectory\appsettings.json"
+
+$nupkgs = gci $Env:ArtifactDirectory\*.nupkg -recurse | Select -ExpandProperty FullName
+
+foreach ($nupkg in $nupkgs){
+	Write-Host "Submitting $nupkg for signing"
+
+	.\SignClient 'sign' -c $appSettings -i $nupkg -r $Env:SignClientUser -s $Env:SignClientSecret -n 'Json.NET' -d 'Json.NET' -u 'https://www.newtonsoft.com/json' 
+
+	Write-Host "Finished signing $nupkg"
+}
+
+Write-Host "Sign-package complete"