Create logging.md

Needless to say, this need review.

docs/logging.md

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+# Events
+
+Docker provides an _events_ command to show system's real time events. Likewise, Dokku can record events as syslog entries and also provides a plugin to display the last ones.
+
+```
+events [-t]                                     Show the last events (-t follows)
+events:list                                     List logged events
+events:on                                       Enable events logger
+events:off                                      Disable events logger
+```
+
+## System logs
+
+The _events_ plugin writes log entries to ``/var/log/syslog`` as well as a Dokku-specific logs sub-directory ``/var/log/dokku/events.log``.