MAINTAINERS: Add an entry for the code of conduct

As I introduced these files, I'm willing to be the maintainer of them as
well.

Acked-by: Chris Mason <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Acked-by: Steven Rostedt (VMware) <[email protected]>
Acked-by: Theodore Ts'o <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

MAINTAINERS

@@ -3681,6 +3681,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/media/coda.txt
 F:	drivers/media/platform/coda/
 
+CODE OF CONDUCT
+M:	Greg Kroah-Hartman <[email protected]>
+S:	Supported
+F:	Documentation/process/code-of-conduct.rst
+F:	Documentation/process/code-of-conduct-interpretation.rst
+
 COMMON CLK FRAMEWORK
 M:	Michael Turquette <[email protected]>
 M:	Stephen Boyd <[email protected]>