Add NuGet and project references to .NET Core sample project

.gitignore

@@ -1,5 +1,6 @@
 bin/
 obj/
+packages/
 
 /ICSharpCode.Decompiler/Properties/AssemblyInfo.cs
 /ILSpy/Properties/AssemblyInfo.cs

SomeSubDir/AnotherSubDir/ClassLibrary3.NETFramework.4.6/ClassLibrary3.NETFramework.4.6.csproj

@@ -30,6 +30,9 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Newtonsoft.Json.13.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
@@ -43,5 +46,8 @@
     <Compile Include="Class3.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

SomeSubDir/AnotherSubDir/ClassLibrary3.NETFramework.4.6/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
+</packages>

WebApplication1.NETCore.2.1/WebApplication1.NETCore.2.1.csproj

@@ -8,4 +8,8 @@
     <PackageReference Include="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\ClassLibraryStd4.NETStandard.2.0\ClassLibrary4.NETStandard.2.0.csproj" />
+  </ItemGroup>
+
 </Project>