Update README.md

Author: swharden

README.md

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 # Spectrogram
-**Spectrogram** is a .NET library which makes it easy to create spectrograms from pre-recorded signals or live audio from the sound card. This library supports .NET Framework (4.5) and .NET Core (3.0).
+**Spectrogram** is a .NET library which makes it easy to create spectrograms from pre-recorded signals or live audio from the sound card. This library supports .NET Framework (4.5) and .NET Core (3.0) and can be installed using [NuGet](https://www.nuget.org/packages/Spectrogram/).
 
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