add docs

.env.example.aad

@@ -51,7 +51,12 @@ AZURE_USERNAME_ATTRIBUTE=userPrincipalName
 ## This should not be necessary if you add a new
 ## attribute for user mapping
 ## Default: false
-#AZURE_USER_IS_UPN=true
+#AZURE_USER_IS_UPN=true 
+## If we want to support nested group memberships
+## this will use transitive members apis instead of
+## direct member apis
+## Default: false
+#AZURE_USE_TRANSITIVE_GROUP_MEMBERS=true
 
 #########################
 ## Additional settings ##