Update README.md

Author: dkackman

README.md

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 # LinqStatistics
 
 [![.NET](https://github.com/dkackman/LinqStatistics/actions/workflows/dotnet.yml/badge.svg)](https://github.com/dkackman/LinqStatistics/actions/workflows/dotnet.yml)
+[![CodeQL](https://github.com/dkackman/LinqStatistics/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/dkackman/LinqStatistics/actions/workflows/github-code-scanning/codeql)
 [![NuGet](https://img.shields.io/nuget/dt/LinqStatistics)](https://www.nuget.org/packages/LinqStatistics/)
 
 - [API Documentation](https://dkackman.github.io/LinqStatistics/)