Adding instructions in README to configure accounting logs

README.md

@@ -296,6 +296,27 @@ List of available settings in your `settings_local.py` file.
 - `MEMBER_MEMBERSHIP_INFO_URL`: Link to a page with information on how to become a member or pay the membership fee
 - `SUBSCRIPTION_REFERENCE`: Pattern used to display a unique reference for any subscription. Helpful for bank wire transfer identification
 
+
+Accounting logs
+---------------
+
+To log 'accounting-related operations' (creation/update of invoice, payment
+and member balance) to a specific file, add the following to settings_local.py :
+
+```
+from settings_base import *
+LOGGING["formatters"]["verbose"] = {'format': "%(asctime)s - %(name)s - %(levelname)s - %(message)s"}
+LOGGING["handlers"]["coin_accounting"] = {
+    'level':'INFO',
+    'class':'logging.handlers.RotatingFileHandler',
+    'formatter': 'verbose',
+    'filename': '/var/log/coin/accounting.log',
+    'maxBytes': 1024*1024*15, # 15MB
+    'backupCount': 10,
+}
+LOGGING["loggers"]["coin.billing"]["handlers"] = [ 'coin_accounting' ]
+```
+
 More information
 ================