Initial readme file

README.md

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+# polka
+Simple but effetctive policy daemon for postfix.
+
+This simple daemon counts the number of messages sent by authenticated users OR by IP (if the SMTP AUTH is not used),
+storing the information in a simple mysql table.
+
+By default, a new entry is created with a default limit (read by configuration), but that value can be overriden
+by the sysadmin simpli updating the table.
+
+In addition, the daemon refuses messages from/to blacklisted sender/recipient, also stored in mysql tables.
+
+Used in production and very stable and effective.