Update README.md add badge from CodeFactor

Author: fernandezja

README.md

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 # ColorHashSharp
 Generate color based on the given string. C# port of [ColorHash Javascript Library](https://github.com/zenozeng/color-hash).
 
-[![NuGet version (ColorHashSharp)](https://img.shields.io/nuget/v/ColorHashSharp.svg?style=flat-square)](https://www.nuget.org/packages/ColorHashSharp/)   [![NuGet Downloads](https://img.shields.io/nuget/dt/ColorHashSharp.svg)](https://www.nuget.org/packages/ColorHashSharp/)
+[![NuGet version (ColorHashSharp)](https://img.shields.io/nuget/v/ColorHashSharp.svg?style=flat-square)](https://www.nuget.org/packages/ColorHashSharp/)   [![NuGet Downloads](https://img.shields.io/nuget/dt/ColorHashSharp.svg)](https://www.nuget.org/packages/ColorHashSharp/)   [![CodeFactor](https://www.codefactor.io/repository/github/fernandezja/colorhashsharp/badge)](https://www.codefactor.io/repository/github/fernandezja/colorhashsharp)
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 [![CI](https://github.com/fernandezja/ColorHashSharp/actions/workflows/dotnet-core.yml/badge.svg)](https://github.com/fernandezja/ColorHashSharp/actions/workflows/dotnet-core.yml)  [![Build status](https://fernandezja.visualstudio.com/ColorHashSharp/_apis/build/status/ColorHashSharp-CI)](https://fernandezja.visualstudio.com/ColorHashSharp/_build/latest?definitionId=4)
 
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 #### Status