[ja] Translate content/ja/docs/reference/glossary/cronjob.md into Japanese (#46875)

* [ja] Translate content/ja/docs/reference/glossary/cronjob.md into Japanese

* [ja] Translate content/ja/docs/reference/glossary/cronjob.md into Japanese

* [ja] Translate content/ja/docs/reference/glossary/cronjob.md into Japanese

* Update content/ja/docs/reference/glossary/cronjob.md

Co-authored-by: Junya Okabe <86868255+Okabe-Junya@users.noreply.github.com>

* Update content/ja/docs/reference/glossary/cronjob.md

Co-authored-by: Junya Okabe <86868255+Okabe-Junya@users.noreply.github.com>

* add newline at the end

---------

Co-authored-by: Junya Okabe <86868255+Okabe-Junya@users.noreply.github.com>

content/ja/docs/reference/glossary/cronjob.md

@@ -0,0 +1,19 @@
+---
+title: CronJob
+id: cronjob
+date: 2018-04-12
+full_link: /ja/docs/concepts/workloads/controllers/cron-jobs/
+short_description: >
+  定期的なスケジュールで繰り返し実行されるタスク(Job)
+
+
+aka: 
+tags:
+- core-object
+- workload
+---
+定期的なスケジュールで実行される[Job](/ja/docs/concepts/workloads/controllers/job/)を管理します。
+
+<!--more-->
+
+*crontab*ファイルでの記述のようにCronJobオブジェクトは[cron](https://ja.wikipedia.org/wiki/Cron)フォーマットを使用しスケジュールを指定できます。