+ bin/Release
  + netstandard1.4
    - mylibrary.dll
  + net452
    - mylibrary.dll

+ bin/Release
  + netstandard1.4
    - mylibrary.pdb
  + net452
    - mylibrary.pdb
  - mylibrary.dll

C:Program Files (x86)Microsoft Visual Studio2017ProfessionalMSBuildSdksNuGet.Build.Tasks.PackbuildCrossTargetingNuGet.Build.Tasks.Pack.targets(73,5): warning : Issue found with package 'MyLibrary'. [D:XXXYYYsrcMyLibraryMyLibrary.csproj]
C:Program Files (x86)Microsoft Visual Studio2017ProfessionalMSBuildSdksNuGet.Build.Tasks.PackbuildCrossTargetingNuGet.Build.Tasks.Pack.targets(73,5): warning : Issue: Assembly not inside a framework folder. D:XXXYYYsrcMyLibraryMyLibrary.csproj]
C:Program Files (x86)Microsoft Visual Studio2017ProfessionalMSBuildSdksNuGet.Build.Tasks.PackbuildCrossTargetingNuGet.Build.Tasks.Pack.targets(73,5): warning : Description: The assembly 'libMyLibrary.dll' is placed directly under 'lib' folder. It is recommended that assemblies be placed inside a framework-specific folder.
C:Program Files (x86)Microsoft Visual Studio2017ProfessionalMSBuildSdksNuGet.Build.Tasks.PackbuildCrossTargetingNuGet.Build.Tasks.Pack.targets(73,5): warning : Solution: Move it into a framework-specific folder. If this assembly is targeted for multiple frameworks, ignore this warning.