DOCSP-51415 Add causal consistency section (#161)

Author: jordan-smith721

source/crud/transactions.txt

@@ -45,6 +45,35 @@ within the session.
    created it. Using a session with a different ``Mongo::Client`` results in
    operation errors.
 
+Causal Consistency
+~~~~~~~~~~~~~~~~~~
+
+.. sharedinclude:: dbx/causal-consistency.rst
+
+   .. replacement:: insert-one-method
+
+      ``insert_one()``
+
+   .. replacement:: update-one-method
+
+      ``update_one()``
+
+   .. replacement:: find-one-method
+
+      ``find()``
+
+   .. replacement:: delete-one-method
+
+      ``delete_one()``
+
+   .. replacement:: majority-rc
+
+      ``:majority``
+
+   .. replacement:: majority-wc
+
+      ``:majority``
+
 Methods 
 -------