Configuration.md: Add link to rule set example file

Author: perlun

documentation/Configuration.md

@@ -14,6 +14,8 @@ StyleCop Analyzers is configured using two separate mechanisms: code analysis ru
 
 Code analysis rule sets are the standard way to configure most diagnostic analyzers within Visual Studio. Information about creating and customizing these files can be found in the [Using Rule Sets to Group Code Analysis Rules](https://docs.microsoft.com/visualstudio/code-quality/using-rule-sets-to-group-code-analysis-rules) documentation on docs.microsoft.com.
 
+Here is an example `.ruleset` file from the Roslyn SDK: https://github.com/dotnet/roslyn-sdk/blob/3e94c5fe1ee981a885c34e2e39383bc4420f2557/RoslynSDK.ruleset. This file illustrates how the severities for individual rules can easily be configured as needed.
+
 ## Getting Started with **stylecop.json**
 
 The easiest way to add a **stylecop.json** configuration file to a new project is using a code fix provided by the project. To invoke the code fix, open any file where SA1633 is reported¹ and press Ctrl+. to bring up the Quick Fix menu. From the menu, select **Add StyleCop settings file to the project**.