Add a site containing general information for GSoC contributors and mentors. It was initially copied from https://www.coreboot.org/GSoC. Change-Id: I5c21d026118cba571dc6b817e89cc4da296a1799 Signed-off-by: Felix Singer <felixsinger@posteo.net> Reviewed-on: https://review.coreboot.org/c/coreboot/+/61791 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: David Hendricks <david.hendricks@gmail.com>