treasurechest/treasurechest/treasurechest.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Sodium.Core" Version="1.2.3" />
  </ItemGroup>

</Project>