add icons for activites view

assets/stylesheets/redmine_meeting.css

@@ -14,4 +14,14 @@ div.tabular > div { margin: 0;
 #meeting_agenda_preview fieldset {margin-top: 1em; background: url(../../../images/draft.png);}
 #meeting_minutes_preview fieldset {margin-top: 1em; background: url(../../../images/draft.png);}
 
-dt.meeting, dt.meeting-agenda, dt.meeting-minutes {/*background-image: url(../../../images/CHANGEME.png);*/}
+dt.meeting {
+  background-image: url(../images/meeting.png);
+}
+
+dt.meeting-agenda {
+  background-image: url(../images/agenda.png);
+}
+
+dt.meeting-minutes {
+  background-image: url(../images/minutes.png);
+}