Documentation: Add some description of our communal places

Change-Id: Iede98359c22aefbfd5725a5e7cd661ef18d7284e
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/31146
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Documentation/community/conferences.md

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+# Conferences
+The coreboot community is present at a number of conferences over the year,
+usually at [FOSDEM](https://fosdem.org), [OSFC](https://osfc.io), and the
+[Chaos Communication Congress](https://events.ccc.de/congress/).
+
+The kind of presence differs, but there's usually a booth or other kind of
+gathering where everybody is welcome to say hello and to learn more about
+coreboot.
+
+Depending on the nature of the conference, coreboot developers might bring
+their development kit with them and conduct development sessions.
+
+## Upcoming events
+
+TODO: add them
+
+## Talks
+
+TODO: link to recorded talks