add submodule, update structure, update read me.md

Eliminated webroot/crt/cacert.pem and made it simply crt/cacert.pem

moved Config, Controller, crt/cacert.pem and read me.md to the root of the repo so that users may simply git clone into their /app/Plugin/Payscape directory.

Signed-off-by: Stephen Mareches <stephen.mareches@payscape.com>
Change ValidateCreditCardIO to Validate()

Signed-off-by: Stephen Mareches <stephen.mareches@payscape.com>