Documentation: move `coding_style.md` inside contributing/

Keep less files in the root directory.

Change-Id: I9eebd0b0826181340ead41af5284362d1cca09d7
Signed-off-by: Alexey Vazhnov <vazhnov@boot-keys.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50852
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

0 files changed, 0 insertions, 0 deletions