icalbuddy: add page (#4033)

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>

pages/osx/icalbuddy.md

@@ -0,0 +1,24 @@
+# icalBuddy
+
+> Command-line utility for prinitng events and tasks from the macOS calendar database.
+> More information: <https://hasseg.org/icalBuddy/>.
+
+- Show events later today:
+
+`icalBuddy -n -f eventsToday`
+
+- Show uncompleted tasks:
+
+`icalBuddy -f uncompletedTasks`
+
+- Show tasks for the next 3 days:
+
+`icalBuddy -n -f tasksDueBefore:today+3`
+
+- Show events in a time range:
+
+`icalBuddy -f eventsFrom:'{{start date}}' to:'{{end date}}'`
+
+- Show custom event list:
+
+`icalBuddy -f -npn -nc -iep "title,datetime" -ps "| : |" -po "datetime,title" -tf "" -df "%RD" -eed eventsToday+10`