Added a CITYLINK_README.txt, explaining the 'Shipment From' country and city codes.
Was Malaysia-specific in v0.00, now should work without modification in other countries.
Citylink returns its quote in the currency of the 'Shipment From' country. If your site's default currency is a foreign currency, v0.00 won't work. This version converts the Citylink quote into your default currency.

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