add analyzer link (#91)

Author: jordan-smith721

source/index.txt

@@ -16,6 +16,7 @@ MongoDB C# Driver
    /whats-new
    /issues-and-help
    /faq
+   MongoDB Analyzer <https://www.mongodb.com/docs/mongodb-analyzer>
 
 Introduction
 ------------
@@ -96,3 +97,11 @@ FAQ
 
 For answers to commonly asked questions about the {+driver-long+}, see the :ref:`csharp-faq`
 section.
+
+MongoDB Analyzer
+----------------
+
+The MongoDB Analyzer is a tool that helps you understand how your
+{+driver-short+} code translates into the MongoDB Query API and if your code
+includes any unsupported LINQ or builder expressions. To learn more, see the
+`MongoDB Analyzer documentation <https://www.mongodb.com/docs/mongodb-analyzer>`__.