[PATCH i-g-t] CONTRIBUTING: Add coding style guidelines

[Louis Chauvet <louis.chauvet@bootlin.com>]

As explained in [1], the submitted patches should follow the same style as
the Linux kernel and must be checked against checkpatch.pl, so add this
recommendation in the CONTRIBUTING.md file.

[1]: https://lore.kernel.org/all/20240314170643.77vzqqoie2otyu4w@kamilkon-desk.igk.intel.com/

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>

To: igt-dev@lists.freedesktop.org
Cc: miquel.raynal@bootlin.com
Cc: thomas.petazzoni@bootlin.com
Cc: jeremie.dautheribes@bootlin.com
Cc: arthurgrillo@riseup.net
Cc: seanpaul@google.com
Cc: marcheu@google.com
Cc: nicolejadeyee@google.com
Cc: kamil.konieczny@linux.intel.com
---
To: igt-dev@lists.freedesktop.org
Cc: miquel.raynal@bootlin.com
Cc: thomas.petazzoni@bootlin.com
Cc: jeremie.dautheribes@bootlin.com
Cc: arthurgrillo@riseup.net
Cc: seanpaul@google.com
Cc: marcheu@google.com
Cc: nicolejadeyee@google.com
Cc: kamil.konieczny@linux.intel.com

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 CONTRIBUTING.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2ab8a48f6ae9..ec8debb4091e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -78,6 +78,8 @@ Sending Patches
 - Changes to the testcases are automatically tested. Take the results into
   account before merging.
 
+- The coding rules are the same as for the Linux kernel. To check for common
+  style problems, you need to use the kernel's checkpatch.pl script.
 
 Commit Rights
 -------------

---
base-commit: ed47dd9fb6b5be6c88513c2816f0f7cfdd0e02f6
change-id: 20240315-add_coding_style-b755454de958

Best regards,
-- 
Louis Chauvet <louis.chauvet@bootlin.com>