Add package README.

Author: sharpjs

Directory.Build.props

@@ -24,6 +24,7 @@
     <PackageTags>dependency graph queue topological</PackageTags>
     <PackageReleaseNotes>$(PackageProjectUrl)/blob/main/CHANGES.md</PackageReleaseNotes>
     <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>$(PackageProjectUrl).git</RepositoryUrl>
   </PropertyGroup>

Directory.Build.targets

@@ -12,10 +12,12 @@
   -->
 
   <ItemGroup Condition="'$(IsPackable)' == 'true'">
-    <None Include="..\icon.png" Link="Properties\icon.png"
+    <None Include="..\icon.png" LinkBase="Properties"
+          Pack="true" PackagePath="" CopyToOutputDirectory="Never" />
+    <None Include="..\LICENSE.txt" LinkBase="Properties"
+          Pack="true" PackagePath="" CopyToOutputDirectory="Never" />
+    <None Include="..\README.md" LinkBase="Properties"
           Pack="true" PackagePath="" CopyToOutputDirectory="Never" />
-    <None Include="..\LICENSE.txt" Link="Properties\LICENSE.txt"
-          Pack="true" PackagePath="$(PackageLicenseFile)" CopyToOutputDirectory="Never" />
   </ItemGroup>
 
   <!-- Visibility -->