DOCSP-48113: C# developer exam (#227)

* DOCSP-48113: C# developer exam

* edits

* lowercase

* LM feedback

Author: norareidy

source/images/icons/general_misc_achievement.png

@@ -73,9 +73,17 @@ More Ways to Learn
 ------------------
 
 .. card-group::
-   :columns: 3
+   :columns: 2
    :style: large-icon
 
+   .. card::
+      :headline: Take the C# Associate Developer Exam
+      :url: https://learn.mongodb.com/courses/mongodb-associate-developer-exam-c-sharp
+      :icon: /images/icons/general_misc_achievement.png
+      :icon-alt: Achievement icon
+
+      C# Associate Developer Exam  →
+
    .. card::
       :headline: View C# developer resources
       :url: https://www.mongodb.com/developer/languages/csharp/