Document import_payments_from_csv command

README.md

@@ -202,6 +202,10 @@ You should run this command in a cron job every day.
 `python manage.py offer_subscriptions_count`: Returns subscription count grouped
 by offer type.
 
+`python manage.py import_payments_from_csv`: Import a CSV from a bank and match
+payments with services and/or members. At the moment, this is quite specific to
+ARN workflow
+
 Configuration
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