Add event logging document comment app.

mayan/apps/document_comments/events.py

@@ -0,0 +1,14 @@
+from __future__ import absolute_import, unicode_literals
+
+from django.utils.translation import ugettext_lazy as _
+
+from events.classes import Event
+
+event_document_comment_create = Event(
+    name='document_comment_create',
+    label=_('Document comment created')
+)
+event_document_comment_delete = Event(
+    name='document_comment_delete',
+    label=_('Document comment deleted')
+)