Japanese translation of Documentation/SubmitChecklist

Hi,

This patch adds SubmitChecklist translated into Japanese to
Documentation/ja_JP directory.
The translated SubmitChecklist has already been reviewed by JF project.

SubmitChecklist is one of the important policy documents.
So, I would like to merge into 2.6.27.

Signed-off-by: Takenori Nagano <t-nagano@ah.jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>