SampleWebApi.csproj

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

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

  <ItemGroup>
    <Folder Include="wwwroot\" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="2.1.0" /> 
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.1.0" /> 
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Json" Version="2.1.0" />     
    <PackageReference Include="Microsoft.DotNet.ILCompiler" Version="1.0.0-alpha-*" />
  </ItemGroup>

</Project>