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  • It's not clear what library you're trying to add or why. You may start by learning to first create a library. The following may be of interest: Tutorial: Create a .NET class library using Visual Studio
    – user246821
    Commented Feb 28 at 15:38
  • If you follow the tutorial mentioned above, you'll discover that a library is it's own project and Visual Studio has a project template for it. If you're using .NET ensure you choose the one for .NET. If you're using .NET Framework ensure you choose the one for .NET Framework.
    – user246821
    Commented Feb 28 at 15:44
  • If your library needs to be used in both .NET and .NET Framework, then read about .NET Standard.
    – user246821
    Commented Feb 28 at 15:50