Adding a guide for cron jobs on shared hosting

[channor]

I recently solved a issue with cron jobs on my shared hosted server. By following these docs, I could not solve the problem. In this PR I have added a description that might work for some developers on shared hosting.

If you like whats added, I hope the position of what is added and the formatting looks okay.

[markstory]

You should use the note blocks. Add

.. note::
   register_argc_argv ....

[channor]

Thanks for feedback 👍

[jeremyharris]

The previous paragraph on the same page spells cron job as cronjob, so I'd use that instead of cron-job.

Also, I wonder about even recommending cd && bin/cake. Perhaps we should remove that bit and change the example to always use the full path?

edit: to clarify, I think we should change the example to use a /full/path/to/bin/cake myShell myParam instead of recommending cd /full/path/to && bin/cake

[channor]

Yes, we should keep the spelling the same.

I added this paragraph because what comes after cd /full/path/to/root && bin/cake was not "read" when the cron was run (myshell myparam wasn't "read") (with my shared hosting (cPanel) ).

Command /full/path/to/root/bin/cake outputs the cake console with my cron jobs, so I can verify that works, but I cannot tell if /full/path/to/root/bin/cake myshell myparam works as I need php to run shells. If someone can verify that /full/path/to/root/bin/cake myshell myparam works, I agree that should be the example.