Add new license/icon properties to our NuGet config

Based on @Kyaa-dost's initial investigation

Keeping old and new formats as not all clients support the new formats in all scenarios yet.

Author: michael-hawker

Directory.Build.props

@@ -5,8 +5,10 @@
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <NoPackageAnalysis>true</NoPackageAnalysis>
     <PackageIconUrl>https://raw.githubusercontent.com/windows-toolkit/WindowsCommunityToolkit/master/build/nuget.png</PackageIconUrl>
+    <PackageIcon>images\nuget.png</PackageIcon>
     <PackageProjectUrl>https://github.com/windows-toolkit/WindowsCommunityToolkit</PackageProjectUrl>
     <PackageLicenseUrl>https://github.com/windows-toolkit/WindowsCommunityToolkit/blob/master/license.md</PackageLicenseUrl>
+    <PackageLicenseFile>license.md</PackageLicenseFile>
     <PackageReleaseNotes>https://github.com/windows-toolkit/WindowsCommunityToolkit/releases</PackageReleaseNotes>
     <Copyright>(c) .NET Foundation and Contributors.  All rights reserved.</Copyright>
     <DefaultLanguage>en-US</DefaultLanguage>
@@ -102,6 +104,8 @@
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)stylecop.json">
       <Link>stylecop.json</Link>
     </AdditionalFiles>
+    <None Include="$(MSBuildThisFileDirectory)license.md" Pack="true" PackagePath="\"/>
+    <None Include="$(MSBuildThisFileDirectory)build\nuget.png" Pack="true" PackagePath="images\"/>
   </ItemGroup>
 
   <Import Project="$(MSBuildThisFileDirectory)build\Windows.Toolkit.VisualStudio.Design.props" Condition="'$(IsDesignProject)' == 'true'"/>

Microsoft.Toolkit.Uwp.Notifications/Microsoft.Toolkit.Uwp.Notifications.nuspec

@@ -7,8 +7,10 @@
     <authors>Microsoft.Toolkit,dotnetfoundation</authors>
     <requireLicenseAcceptance>true</requireLicenseAcceptance>
     <licenseUrl>https://github.com/windows-toolkit/WindowsCommunityToolkit/blob/master/license.md</licenseUrl>
+    <license type="file">license.md</license>
     <projectUrl>https://github.com/windows-toolkit/WindowsCommunityToolkit</projectUrl>
     <iconUrl>https://raw.githubusercontent.com/windows-toolkit/WindowsCommunityToolkit/master/build/nuget.png</iconUrl>
+    <icon>images\nuget.png</icon>
     <description>The official way to send toast notifications on Windows 10 via code rather than XML, with the help of IntelliSense. Supports all C# app types, including WPF, UWP, WinForms, and Console, even without packaging your app as MSIX. Also supports C++ UWP apps.
 
       Additionally, generate notification payloads from your ASP.NET web server to send as push notifications, or generate notification payloads from class libraries.
@@ -52,6 +54,8 @@
     </dependencies>
   </metadata>
   <files>
+    <file src="..\build\nuget.png" target="images\" />
+    <file src="..\license.md" target="" />
     <file src="Microsoft.Toolkit.Uwp.Notifications.targets" target="build\native\Microsoft.Toolkit.Uwp.Notifications.targets" />
     <file src="$buildOutput$\net461\Microsoft.Toolkit.Uwp.Notifications.dll" target="lib\net461\Microsoft.Toolkit.Uwp.Notifications.dll" />
     <file src="$buildOutput$\net461\Microsoft.Toolkit.Uwp.Notifications.pdb" target="lib\net461\Microsoft.Toolkit.Uwp.Notifications.pdb" />