Updated Enabling Configuration Doc for VS2015U3

Added the steps needed to enable the configuration in Visual Studio 2015 Update 3

Author: aboo

documentation/EnableConfiguration.md

@@ -4,6 +4,13 @@ At this time, the code fix is not able to fully configure the newly-created **st
 tracked in bug report [dotnet/roslyn#4655](https://github.com/dotnet/roslyn/issues/4655). In the mean time, users must
 manually perform the following additional steps after creating the **stylecop.json** file.
 
+In Visual Studio 2015 Update 3 and newer:
+
+1. Select the file in **Solution Explorer**.
+2. In the Properties window set the value for **Build Action** to **AdditionalFiles**.
+
+In older versions of Visual Studio 2015:
+
 1. Right click the project in **Solution Explorer** and select **Unload Project**. If you are asked to save changes,
    click **Yes**.
 2. Right click the unloaded project in **Solution Explorer** and select **Edit *ProjectName*.csproj**.