Add eCommerce System + Template Folder

- Create a page template folder inside the theme directory and its own 'modules' folder inside. This is the place for all future page templates.

- After installing the 'Ready! eCommerce Plugin', clone its 'modules' into an 'ecommerce_modules' folder in the theme directory. This allows me to edit the html templates of the commerce system and still keep them in the theme repository.

- Add instructions on how to adjust the plugin config into the read me

Signed-off-by: Dima Markus <dmi3000@gmail.com>