(DOCSP-31236) user role requirements for kafka connector

Author: carriecwk

source/introduction/connect.txt

@@ -31,6 +31,12 @@ The following is an example of a connection URI for a MongoDB replica set:
 To learn more about the connection URI format, see
 :manual:`Connection String URI Format </reference/connection-string/>` in the MongoDB Manual.
 
+Prerequisites
+-------------
+
+To connect the {+conenctor+} to MongoDB, you need to set ``readWrite`` or 
+``readAnyDatabase`` and ``clusterMonitor`` roles for the database user.
+
 How to Connect
 --------------