[C#] Logging Example shown has a package dependency (#178)

* add package req

Author: rachel-mack

source/fundamentals/logging.txt

@@ -4,6 +4,13 @@
 Logging
 =======
 
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: loggerfactory, logger, audit
+
 .. contents:: On this page
    :local:
    :backlinks: none
@@ -18,6 +25,12 @@ Starting in version 2.18, the {+driver-short+} uses the standard
 In this guide, you can learn how to use the driver to configure logging for your 
 application. 
 
+.. important::
+
+   To use this feature, you must add the `Microsoft.Extensions.Logging package
+   <https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.logging>`__
+   to your project.
+
 Configure Logging
 -----------------