Enable Windows targeting in build properties

Author: glennawatson

src/Directory.build.props src/Directory.Build.propssrc/Directory.build.props renamed to src/Directory.Build.props

@@ -32,6 +32,7 @@
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <IncludePackageReferencesDuringMarkupCompilation>true</IncludePackageReferencesDuringMarkupCompilation>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EnableWindowsTargeting>true</EnableWindowsTargeting>
   </PropertyGroup>
   <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>