locking/Documentation: Add Korean translation

This commit adds Korean version of memory-barriers.txt document.  The
header is referred to HOWTO Korean version.

The translation has started from Feb, 2016 and using a public git
repository[1] to maintain the work.  It's commit history says that it is
following upstream changes as well.

[1] https://github.com/sjp38/linux.doc_trans_membarrier

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Byungchul Park <byungchul.park@lge.com>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1470939463-31950-4-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>