Icalendar templates for recurrence rules

To provide a starting point for advanced repeating items.

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

contrib/import/DST-et.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART;VALUE=DATE:20200329
+SUMMARY:Daylight Saving Time begins (EDT)
+RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
+END:VEVENT
+END:VCALENDAR

contrib/import/DST-eu.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART;VALUE=DATE:20200329
+SUMMARY:Daylight Saving Time begins (CEST)
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
+END:VEVENT
+END:VCALENDAR

contrib/import/February.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART:20200228T080000
+SUMMARY:Penultimate day in February
+RRULE:FREQ=MONTHLY;BYMONTHDAY=-2;BYMONTH=2
+END:VEVENT
+END:VCALENDAR

contrib/import/Monday-first-last.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART:20200106T120000
+SUMMARY:First and last Monday of the month
+RRULE:FREQ=MONTHLY;BYDAY=1MO,-1MO;COUNT=10
+END:VEVENT
+END:VCALENDAR

contrib/import/Tuesday-Thursday.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART:20200102T120000
+SUMMARY:Every Tuesday and Thursday
+RRULE:FREQ=WEEKLY;BYDAY=TU,TH;COUNT=10
+END:VEVENT
+END:VCALENDAR

contrib/import/Wednesdays-all.ical

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+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:
+BEGIN:VEVENT
+DTSTAMP:
+UID:
+DTSTART;VALUE=DATE:20200603
+SUMMARY:All Wednesdays in June and July
+RRULE:FREQ=MONTHLY;BYDAY=WE;BYMONTH=6,7;UNTIL=20220630
+END:VEVENT
+END:VCALENDAR