HelloWorldFS.fsproj

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

    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>netcoreapp2.1</TargetFramework>
    </PropertyGroup>

    <ItemGroup>
        <Compile Include="Program.fs" />
    </ItemGroup>

    <ItemGroup>
      <PackageReference Include="System.Reactive" Version="4.1.2" />
      <PackageReference Include="Trill" Version="2018.12.13.2" />
    </ItemGroup>

</Project>