Add nuget packages (#789)

Author: v-wuzhai

eng/Build.props

@@ -28,6 +28,14 @@
 
     <DependencyPackageProjects Include="$(RepoRoot)src\targetPacks\ILsrc\**\Microsoft.NETCore.App.Ref.6.0.2.csproj" />
     <DependencyPackageProjects Include="$(RepoRoot)src\targetPacks\ILsrc\**\Microsoft.AspNetCore.App.Ref.6.0.2.csproj" />
+
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Frameworks.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Common.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Versioning.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Configuration.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Packaging.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Protocol.6.7.0.csproj" />
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\NuGet.Credentials.6.7.0.csproj" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(BuildDependencyPackageProjects)' == 'true'">

src/referencePackages/src/nuget.common/6.7.0/NuGet.Common.6.7.0.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <AssemblyName>NuGet.Common</AssemblyName>
+    <ProjectTemplateVersion>2</ProjectTemplateVersion>
+    <StrongNameKeyId>MicrosoftShared</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <PackageReference Include="NuGet.Frameworks" Version="6.7.0" />
+  </ItemGroup>
+
+</Project>