DOCSP-38806: mdb 3.6 deprecation (#29)

(cherry picked from commit 3283392)

Author: rustagir

source/index.txt

@@ -14,6 +14,7 @@
 
    /installation/
    /get-started/
+   /whats-new/
    /tutorials/
    /reference/
    View the Source <https://github.com/mongodb/mongo-java-driver>
@@ -32,6 +33,8 @@ runnable project by following one of the tutorials.
 
 - :ref:`javars-get-started`
 
+- :ref:`javars-whats-new`
+
 - :ref:`javars-tutorials`
 
 - :ref:`javars-reference`

source/whats-new.txt

@@ -0,0 +1,36 @@
+.. _javars-whats-new:
+
+==========
+What's New
+==========
+
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: update, new feature, deprecation, upgrade
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 1
+   :class: singlecol
+
+Learn about new features, improvements, and fixes introduced in the
+following versions of the {+driver-long+}:
+
+* :ref:`Version 5.1 <javars-version-5.1>`
+
+.. _javars-version-5.1:
+
+What's New in 5.1
+-----------------
+
+.. important:: MongoDB Server v3.6 End-of-Life
+
+   Support for MongoDB Server v3.6 is deprecated in this
+   release and will be removed in the v5.2 release of the driver.
+
+To learn about other changes introduced in v5.1, see the :driver:`What's
+New </java/sync/current/whats-new/>` guide in the Java Sync Driver documentation.