Add steps for setup data for performance testing

[agilecreativity]

Hi @anthony-khong

This PR add the steps required to properly run the code via the REPL. I think this is required so that the data is available during session.

I basically duplicate the code that you had from the example code as I can't use it directly due to the namespace issue.

Please let me know if you need me to update anything. Or please feel free to adjust if you like.

Thanks, Burin

[codecov-io]

Codecov Report

Merging #247 into develop will not change coverage. The diff coverage is n/a.

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[anthony-khong]

Thank you! Indeed, that part of the cookbook is less straightforward than the other parts, because of the data it uses. Thank you for addressing it!