DOCSP-39980 - GridFS (mongodb#289) (mongodb#329)

(cherry picked from commit 86eb2be)
(cherry picked from commit af51528)

Author: mongoKart

source/fundamentals.txt

@@ -29,6 +29,7 @@ Fundamentals
    Time Series Collections </fundamentals/time-series>
    In-Use Encryption </fundamentals/encrypt-fields>
    Search Geospatially </fundamentals/geo>
+   Store Large Files </fundamentals/gridfs>
    Replica Set Operations </fundamentals/read-write-configuration>
    OData </fundamentals/odata>
 
@@ -50,4 +51,5 @@ Fundamentals
 - :ref:`csharp-time-series`
 - :ref:`Encrypt Fields <csharp-fle>`
 - :ref:`csharp-geo`
+- :ref:`csharp-gridfs`
 - :ref:`csharp-read-write-config`

source/fundamentals/crud/write-operations/insert.txt

@@ -23,6 +23,11 @@ Overview
 In this guide, you can learn how to use the {+driver-long+} to add
 documents to a MongoDB collection by performing insert operations.
 
+.. note:: 16 MB Size Limit
+
+   MongoDB limits individual BSON documents to 16 MB. If your document is larger than 16 MB,
+   use the :ref:`GridFS <csharp-gridfs>` API instead.
+ 
 An insert operation inserts one or more documents into a MongoDB collection.
 The {+driver-short+} provides the following methods to perform insert
 operations, each of which has an asynchronous and synchronous version: