Update README.md

Author: hyazinthh

README.md

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 ![MacOS](https://github.com/aardvark-platform/aardvark.opencv/workflows/MacOS/badge.svg)
 ![Linux](https://github.com/aardvark-platform/aardvark.opencv/workflows/Linux/badge.svg)
 
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+[![NuGet](https://badgen.net/nuget/v/Aardvark.OpenCV)](https://www.nuget.org/packages/Aardvark.OpenCV/)
+[![NuGet](https://badgen.net/nuget/dt/Aardvark.OpenCV)](https://www.nuget.org/packages/Aardvark.OpenCV/)
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 Contains algorithms and utilities using OpenCV via the [OpenCVSharp](https://github.com/shimat/opencvsharp) wrapper for the Aardvark Platform.