gcalcli: add page (#3253)

pages/common/gcalcli.md

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+# gcalcli
+
+> Command line tool to interact with Google Calendar.
+> Requests Google API authorization upon first launch.
+> More information: <https://github.com/insanum/gcalcli>.
+
+- List your events for all your calendars over the next 7 days:
+
+`gcalcli agenda`
+
+- Show events starting from or between specific dates (also takes relative dates e.g. "tomorrow"):
+
+`gcalcli agenda {{mm/dd}} [{{mm/dd}}]`
+
+- List events from a specific calendar:
+
+`gcalcli --calendar {{calendar_name}} agenda`
+
+- Display an ASCII calendar of events by week:
+
+`gcalcli calw`
+
+- Display an ASCII calendar of events for a month:
+
+`gcalcli calm`
+
+- Quick-add an event to your calendar:
+
+`gcalcli --calendar {{calendar_name}} quick "{{mm/dd}} {{HH:MM}} {{event_name}}"`
+
+- Add an event to calendar. Triggers interactive prompt:
+
+`gcalcli --calendar "{{calendar_name}}" add`