Switch to License Expression for Simplicity

Keep embedded license file though as well.

Author: michael-hawker

Directory.Build.props

@@ -7,8 +7,7 @@
     <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>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>    
     <PackageReleaseNotes>https://github.com/windows-toolkit/WindowsCommunityToolkit/releases</PackageReleaseNotes>
     <Copyright>(c) .NET Foundation and Contributors.  All rights reserved.</Copyright>
     <DefaultLanguage>en-US</DefaultLanguage>

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

@@ -7,7 +7,7 @@
     <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>
+    <license type="expression">MIT</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>