Document how to set up cron jobs in README.md [$25 awarded]

[lewisgoddard]

Steps for configuring cron should go under a h3 header titled "Cron", immediately after the current Configuration section. Should be in a list-format to match the Installation section. Try to keep things as simple as possible, and maybe don't run both cron jobs at once, delay the backup for a couple of minutes. Always give root-relative file names in backticks, along with any code that needs changing. Make sure all code blocks are clearly labeled before they occur.

• Configure _cron/hourly/backup-database.sh (path, username, password, database)
• Configure for _cron/hourly/clean-and-optimize.php
• Example crontab.
• Disable cleaning in requests.

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[lewisgoddard]

This issue is no longer in progress.