Add v2022dev0 release schedule

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/release/v2022dev0/release_schedule.md

++++
+date = "2020-09-30"
+weight = 100
+
+title = "v2022dev0 Release Schedule"
+
++++
+
+The v2022dev0 release cycle started in October 2020.
+
+| Milestone                                                                                                | Date           |
+| -------------------------------------------------------------------------------------------------------- | -------------- |
+| Start of release cycle                                                                                   | 2020-10-01     |
+| Soft feature freeze: end of feature proposal and review period                                           | 2020-11-17     |
+| Soft code freeze/hard feature freeze: end of feature development for this release, only bugfixes allowed | 2020-11-24     |
+| Release candidate 1 (RC1)/hard code freeze: no new code changes may be made after this date              | 2020-11-30     |
+| RC testing                                                                                               | 2020-12-01..07 |
+| v2022dev0 release                                                                                        | 2020-12-22     |
+
+If the release candidate 1 does not successfully pass all required
+tests, then the issues will be fixed and a new release candidate will be
+re-tested. This would delay the release, which would be reflected on
+this page.
+
+## See also
+
+  - [Roadmap]( {{< ref "/roadmap.md" >}} )
+  - Previous [release schedules]( {{< ref "/releases.md" >}} ) and more
+    information about the timeline