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/forums.md

@@ -0,0 +1,18 @@
+# Our forums
+
+The coreboot community has various venues to help each other and discuss the
+direction of our project.
+
+## Mailing list
+
+The first address for coreboot related discussion is our mailing list.
+You can subscribe on its
+[information page](https://mail.coreboot.org/postorius/lists/coreboot.coreboot.org/) and
+read its
+[archives](https://mail.coreboot.org/hyperkitty/list/coreboot@coreboot.org/).
+
+## IRC
+
+We also have a
+[real time chat](https://webchat.freenode.net?channels=%23coreboot)
+on the Freenode IRC network's #coreboot channel.