Add NuGet link to README.md

Author: 9ee1

README.md

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 # Capstone.NET
 Capstone.NET is an opinionated .NET Core and a .NET Framework binding for the [Capstone disassembly framework](http://www.capstone-engine.org). It is written in C#, supports _Capstone 4_, and has a friendly and simple type safe API that is ridiculously easy to learn and quick to pick up.
 
+[![Nuget](https://img.shields.io/nuget/dt/Gee.External.Capstone?label=Capstone.NET%20V2.0.2&style=for-the-badge)](https://www.nuget.org/packages/Gee.External.Capstone)
+
 ## Features
 (+) Supports _Capstone 4_. Only the ARM, ARM64, M68K, MIPS, PowerPC, X86, and XCore architectures are supported right now