rspamd: Added

rspamd/README

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+rspamd (An advanced spam filtering system)
+
+Rspamd is an advanced spam filtering system that allows evaluation of
+messages by a number of rules including regular expressions, statistical
+analysis and custom services such as URL black lists. Each message is
+analysed by Rspamd and given a spam score.
+
+According to this spam score and the user's settings Rspamd recommends
+an action for the MTA to apply to the message: for example, to pass, to
+reject or to add a header. Rspamd is designed to process hundreds of
+messages per second simultaneously and has a number of features
+available.
+
+Groupname and Username
+
+You must have the "rspamd" group and user to run this script, for example:
+
+  groupadd -g 359 rspamd
+  useradd -u 359 -s /bin/false -d /dev/null -g rspamd rspamd