Create manage.en.md

docs/manage.en.md

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+# Management guide
+
+## Check the status of the job queue
+In the directory of Misskey:
+``` shell
+node_modules/kue/bin/kue-dashboard -p 3050
+```
+When you access port 3050, you will see the UI.
+
+## Suspend users
+``` shell
+node cli/suspend (User-ID)
+```