Work CI-CD

- Add target for .NET Framework v4.7.2

Author: josesimoes

nanoFramework.CoreLibrary.nuspec

@@ -13,12 +13,14 @@
     <projectUrl>https://github.com/nanoframework/CoreLibrary</projectUrl>
     <icon>images\nf-logo.png</icon>
     <repository type="git" url="https://github.com/nanoframework/CoreLibrary" commit="$commit$" />
-    <copyright>Copyright (c) .NET Foundation and Contributors</copyright>    
+    <copyright>Copyright (c) .NET Foundation and Contributors</copyright>
     <description>This package includes the CoreLibrary assembly for .NET nanoFramework C# projects.&#10;This package requires a target with mscorlib v$nativeVersion$ (checksum $checksum$).&#10;In case you don't need the System.Reflection API there is another NuGet package without this API.</description>
     <tags>nanoFramework C# csharp netmf netnf nanoFramework.CoreLibrary</tags>
   </metadata>
   <files>
     <file src="nanoFramework.CoreLibrary\bin\Release\mscorlib.*" target="lib\netnano1.0" />
+    <!-- need to target .NET Framework 4.7.2 to allow reference from VS extensionb project -->
+    <file src="nanoFramework.CoreLibrary\bin\Release\mscorlib.*" target="lib\net472" />
     <file src="assets\readme.txt" target="" />
     <file src="README.md" target="docs\" />
     <file src="assets\nf-logo.png" target="images" />