opentelemetry-dotnet/docs/logs/extending-the-sdk/extending-the-sdk.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Logging" />
    <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry\OpenTelemetry.csproj" />
  </ItemGroup>
</Project>