[releng] Add schedule README

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a7431c16e65d568989b7cd542d239fd0087559c7
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Mar 30 09:34:12 2020 -0500

    Add schedule README

 tools/schedule/README | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/tools/schedule/README b/tools/schedule/README
new file mode 100644
index 0000000..867113a
--- /dev/null
+++ b/tools/schedule/README
@@ -0,0 +1,12 @@
+To set the schedule for a new version of GNOME, after creating a new .schedule file:
+
+* Bump version number for DEFAULT_SCHEDULE in releng/tools/schedule/libschedule.py
+* Run releng/tools/schedule/ical.py > 3.x.ics to create ICAL file
+* git add/commit/push that ics file into releng/tools/schedule/
+* Run releng/tools/schedule/wiki.py to create copy&paste schedule to paste into wikipage
+* Copy skeleton from https://wiki.gnome.org/ThreePointThirtyfive to 
https://wiki.gnome.org/ThreePointThirtyseven , update numbers, add the schedule
+* Copy ics file to Infrastructure/static-web/calendars and git commit/push it
+* Announce schedule on d-a-l
+** Example: https://mail.gnome.org/archives/devel-announce-list/2019-September/msg00003.html
+* Ask sysadmins to update the redirect of https://www.gnome.org/start/unstable
+* Update version numbers on https://wiki.gnome.org/Schedule