DOCSP-32297 adds compatibility info to landing page (#121)

Author: kyuan-mongodb

source/includes/fact-environments.rst

@@ -0,0 +1,7 @@
+- `MongoDB Atlas
+  <https://www.mongodb.com/docs/atlas>`__: The fully
+  managed service for MongoDB deployments in the cloud
+- :ref:`MongoDB Enterprise <install-mdb-enterprise>`: The
+  subscription-based, self-managed version of MongoDB
+- :ref:`MongoDB Community <install-mdb-community-edition>`: The
+  source-available, free-to-use, and self-managed version of MongoDB

source/index.txt

@@ -40,6 +40,14 @@ Previous Versions
 
 For documentation on versions of the driver v2.18 and earlier, see the :ref:`csharp-previous-versions` section.
 
+Compatibility
+-------------
+
+You can use the {+driver-short+} to connect to deployments hosted in the
+following environments:
+
+.. include:: /includes/fact-environments.rst
+
 Quick Start
 -----------