Updated Readme to include a link to configure log4net

Author: raylevi1

README.md

@@ -6,6 +6,7 @@ Library for Stackify users to integrate Stackify in to their projects. Provides
 - [Stackify homepage](http://www.stackify.com)
 - [Stackify documentation site](http://support.stackify.com/)
 - [NuGet packages](https://www.nuget.org/packages?q=Stackify)
+- [Configure log4net](https://docs.stackify.com/docs/errors-and-logs-log4net)
 - [Best practices for logging with C#](https://stackify.com/csharp-logging-best-practices/)
 - [Why you should use tags in your logs](https://stackify.com/get-smarter-log-management-with-log-tags/)