#2178 Set Package readme (#2180)

Author: thompson-tomo

src/Directory.Build.props

@@ -16,6 +16,7 @@
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
         <NoWarn>$(NoWarn);1591</NoWarn>
         <LangVersion>11</LangVersion>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
     </PropertyGroup>
 
     <ItemGroup>

src/RestSharp/RestSharp.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
     </PropertyGroup>
@@ -54,4 +54,7 @@
     <ItemGroup>
         <ProjectReference Include="$(RepoRoot)\gen\SourceGenerator\SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     </ItemGroup>
+    <ItemGroup>
+        <None Include="..\..\README.md" Pack="true" PackagePath="\" />
+    </ItemGroup>
 </Project>