Add dnx shim project

Author: dsplaisted

sdk.slnx

@@ -85,6 +85,7 @@
     <Project Path="src/Containers/packaging/package.csproj" />
   </Folder>
   <Folder Name="/src/Layout/">
+    <Project Path="src/Layout/dnx/dnx.csproj" />
     <Project Path="src/Layout/finalizer/finalizer.csproj" />
     <Project Path="src/Layout/pkg/dotnet-sdk.proj" Type="C#" />
     <Project Path="src/Layout/redist/redist.csproj" />

src/Layout/dnx/dnx.cs

@@ -0,0 +1,2 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.

src/Layout/dnx/dnx.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>$(SdkTargetFramework)</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <PublishAot>true</PublishAot>
+    <ControlFlowGuard>Guard</ControlFlowGuard>
+    <UseSystemResourceKeys>true</UseSystemResourceKeys>
+    <SatelliteResourceLanguages>en-US</SatelliteResourceLanguages>
+    <OptimizationPreference>Size</OptimizationPreference>
+    <StackTraceSupport>false</StackTraceSupport>
+    <_IsPublishing>true</_IsPublishing>
+  </PropertyGroup>
+
+  <Target Name="PublishOnBuild" AfterTargets="Build" DependsOnTargets="Publish" Condition="'$(PublishAot)' == 'true'" />
+
+</Project>