DOCSP-27882 Atlas search page (#81)

Author: jordan-smith721

source/fundamentals.txt

@@ -13,6 +13,7 @@ Fundamentals
    /fundamentals/connection
    /fundamentals/crud
    /fundamentals/builders
+   /fundamentals/atlas-search
    /fundamentals/data-formats
    /fundamentals/stable-api
    /fundamentals/authentication
@@ -24,6 +25,7 @@ Fundamentals
 - :ref:`Connecting to MongoDB <csharp-connection>`
 - :ref:`csharp-crud`
 - :ref:`csharp-builders`
+- :ref:`csharp-atlas-search`
 - :ref:`csharp-data-formats`
 - :ref:`csharp-stable-api`
 - :ref:`csharp-authentication-mechanisms`