Add devfile and community documentation to /public (#3045)

**What type of PR is this?**
> Uncomment only one ` /kind` line, and delete the rest.
> For example, `> /kind bug` would simply become: `/kind bug`

/kind documentation
[skip ci]

**What does does this PR do / why we need it**:

This moves the "upstream" documentation that we have here:
https://github.com/openshift/odo/tree/gh-pages/chosen-docs/upstream to
our main `master` branch to we have one central place for documentation
changes.

**Which issue(s) this PR fixes**:

N/A

**How to test changes / Special notes to the reviewer**:

N/A

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

docs/public/community.adoc

@@ -0,0 +1,67 @@
+== Events
+
+=== Upcoming events
+
+* https://www.redhat.com/en/summit[April 28-29 2020 - Red Hat Summit]
+* https://www.ibm.com/events/think/[May 5-6 2020 - IBM Think Digital]
+
+== Slack
+
+Join us on Slack via our
+https://join.slack.com/t/openshiftdo/shared_invite/enQtODUwMjIzMzE2MjYyLWM3YjlkNTViOGNjZGQ5YjFlMzc2N2RhZjVmMDQ5NWY5ZDQ3NzMzZjYxMTE1MjY5OTVmZjgxZWMyMGRmOTc4Y2I[invite
+link]
+
+* https://openshiftdo.slack.com/messages/odo-dev[Odo Dev Channel] -
+Discuss odo development
+* https://openshiftdo.slack.com/messages/odo-users[Odo Users Channel] -
+Ask questions and discuss your use cases with odo
+
+== Email list
+
+For general help and inquiries as well as developmental discussion, we
+use Google Groups as our email list.
+
+* https://groups.google.com/forum/#!forum/odo-users[odo-users Google
+group] - General help and inquiries
+* https://groups.google.com/forum/#!forum/odo-dev[odo-dev Google group]
+- Developmental discussion
+
+== Issues
+
+* If you have any issues with odo, please
+https://github.com/openshift/odo/issues[file a GitHub issue]
+* Documentation issues can be filed with the
+https://github.com/openshift/odo/issues/new?template=Documentation.md[documentation
+template]
+
+== Public meetings
+
+Every two weeks, we have a contributors call meeting.
+
+Every three weeks, we have two planning calls:
+
+* ``Sprint Planning Preparation and Issue Triage'' - on Monday
+* ``Sprint Planning'' - on Wednesday
+
+You can find the exact dates of all scheduled odo calls together with
+sprint dates in the
+https://calendar.google.com/calendar/embed?src=gi0s0v5ukfqkjpnn26p6va3jfc%40group.calendar.google.com[odo
+calendar].
+
+To automatically get invites to the calls, add yourself to the
+https://groups.google.com/forum/#!forum/odo-dev[odo-dev Google group].
+
+== Contributing
+
+=== Where do I start?
+
+Odo is a complex project that touches both Kubernetes, OpenShift and
+Docker. We have a list of
+https://github.com/openshift/odo/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22[good
+first issues] to help start.
+
+=== How do I contribute code?
+
+Want to submit your code? Have a look at our
+https://github.com/openshift/odo/blob/master/docs/dev/development.adoc[development
+guide]. It goes over every aspect from submitting to writing tests.