Test: add managed Rivet end-to-end smoke project

Author: turinglambdaai

racket/tests/dotnet-rivet-smoke/Taskly.RivetSmoke.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(RivetRoot)/platform/dotnet/Rivet.Runtime/Rivet.Runtime.csproj" />
+    <Compile Include="../../../dotnet/GeneratedBackend.cs" Link="GeneratedBackend.cs" />
+  </ItemGroup>
+</Project>