Add CREDITS entry for Shaohua Li

Signed-off-by: Jens Axboe <axboe@kernel.dk>

CREDITS

@@ -2208,6 +2208,12 @@ N: Christopher Li
 E: sparse@chrisli.org
 D: Sparse maintainer 2009 - 2018
 
+N: Shaohua Li
+D: Worked on many parts of the kernel, from core x86, ACPI, PCI, KVM, MM,
+D: and much more. He was the maintainer of MD from 2016 to 2018. Shaohua
+D: passed away late 2018, he will be greatly missed.
+W: https://www.spinics.net/lists/raid/msg61993.html
+
 N: Stephan Linz
 E: linz@mazet.de
 E: Stephan.Linz@gmx.de