MAINTAINERS: Add csky

Add a maintainer information for the csky(C-SKY) architecture.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -3218,6 +3218,15 @@ T:	git git://git.alsa-project.org/alsa-kernel.git
 S:	Maintained
 F:	sound/pci/oxygen/
 
+C-SKY ARCHITECTURE
+M:	Guo Ren <ren_guo@c-sky.com>
+T:	git https://github.com/c-sky/csky-linux.git
+S:	Supported
+F:	arch/csky/
+F:	Documentation/devicetree/bindings/csky/
+K:	csky
+N:	csky
+
 C6X ARCHITECTURE
 M:	Mark Salter <msalter@redhat.com>
 M:	Aurelien Jacquiot <jacquiot.aurelien@gmail.com>