Update README.md (#12)

Author: bitfaster

README.md

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 Generate plots for [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet) using [Plotly.NET](https://github.com/plotly/Plotly.NET/).
 
+[![NuGet version](https://badge.fury.io/nu/benchly.svg)](https://badge.fury.io/nu/benchly) ![Nuget](https://img.shields.io/nuget/dt/benchly) 
+
 # Getting started
 
 Benchly is installed from NuGet: