apps: translation: Add README

Signed-off-by: xychen <xychen@listenai.com>
1 job 于feature/translation-readme in 2 minute 和 27 second (queued for 31 second)
状态 作业 ID 名称 覆盖率
  Ztest
已通过 #64049
zgsz-03 generic
ztest_build_only

00:02:27