Gets the nuget package location

NugetPackagesPath.props

<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
<Project>
  <PropertyGroup>
    <!-- Respect environment variable for the NuGet Packages Root if set; otherwise, use the current default location -->
    <NuGetPackageRoot Condition="'$(NuGetPackageRoot)' == ''">$(NUGET_PACKAGES)</NuGetPackageRoot>
    <NuGetPackageRoot Condition="'$(NuGetPackageRoot)' == '' AND '$(OS)' == 'Windows_NT'">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
    <NuGetPackageRoot Condition="'$(NuGetPackageRoot)' == '' AND '$(OS)' != 'Windows_NT'">$([System.Environment]::GetFolderPath(SpecialFolder.Personal))\.nuget\packages\</NuGetPackageRoot>
    <NuGetPackageRoot Condition="!HasTrailingSlash('$(NuGetPackageRoot)')">$(NuGetPackageRoot)\</NuGetPackageRoot>
  </PropertyGroup>
</Project>