Mark package projects, so APIScan leaves them alone.

Author: StephenMolloy

src/packages/ConfigurationBuilders.Azure.nupkg/Microsoft.Configuration.ConfigurationBuilders.Azure.nuproj

@@ -5,6 +5,7 @@
         <AssemblyName>Microsoft.Configuration.ConfigurationBuilders.Azure</AssemblyName>
         <NuGetPackageId>$(MSBuildProjectName)</NuGetPackageId>
         <NuSpecFile>Microsoft.Configuration.ConfigurationBuilders.Azure.nuspec</NuSpecFile>
+        <IsPackage>true</IsPackage>
     </PropertyGroup>
     <ItemGroup>
         <NuGetContent Include="$(AssemblyName).dll">

src/packages/ConfigurationBuilders.Base.nupkg/Microsoft.Configuration.ConfigurationBuilders.Base.nuproj

@@ -5,6 +5,7 @@
         <AssemblyName>Microsoft.Configuration.ConfigurationBuilders.Base</AssemblyName>
         <NuGetPackageId>$(MSBuildProjectName)</NuGetPackageId>
         <NuSpecFile>Microsoft.Configuration.ConfigurationBuilders.Base.nuspec</NuSpecFile>
+        <IsPackage>true</IsPackage>
     </PropertyGroup>
     <ItemGroup>
         <NuGetContent Include="$(AssemblyName).dll">

src/packages/ConfigurationBuilders.Environment.nupkg/Microsoft.Configuration.ConfigurationBuilders.Environment.nuproj

@@ -5,6 +5,7 @@
         <AssemblyName>Microsoft.Configuration.ConfigurationBuilders.Environment</AssemblyName>
         <NuGetPackageId>$(MSBuildProjectName)</NuGetPackageId>
         <NuSpecFile>Microsoft.Configuration.ConfigurationBuilders.Environment.nuspec</NuSpecFile>
+        <IsPackage>true</IsPackage>
     </PropertyGroup>
     <ItemGroup>
         <NuGetContent Include="$(AssemblyName).dll">

src/packages/ConfigurationBuilders.Json.nupkg/Microsoft.Configuration.ConfigurationBuilders.Json.nuproj

@@ -5,6 +5,7 @@
         <AssemblyName>Microsoft.Configuration.ConfigurationBuilders.Json</AssemblyName>
         <NuGetPackageId>$(MSBuildProjectName)</NuGetPackageId>
         <NuSpecFile>Microsoft.Configuration.ConfigurationBuilders.Json.nuspec</NuSpecFile>
+        <IsPackage>true</IsPackage>
     </PropertyGroup>
     <ItemGroup>
         <NuGetContent Include="$(AssemblyName).dll">

src/packages/ConfigurationBuilders.UserSecrets.nupkg/Microsoft.Configuration.ConfigurationBuilders.UserSecrets.nuproj

@@ -5,6 +5,7 @@
         <AssemblyName>Microsoft.Configuration.ConfigurationBuilders.UserSecrets</AssemblyName>
         <NuGetPackageId>$(MSBuildProjectName)</NuGetPackageId>
         <NuSpecFile>Microsoft.Configuration.ConfigurationBuilders.UserSecrets.nuspec</NuSpecFile>
+        <IsPackage>true</IsPackage>
     </PropertyGroup>
     <ItemGroup>
         <NuGetContent Include="$(AssemblyName).dll">