USER STORY: Enter payment details

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As a shopper, I can enter payment details so that I can checkout as quickly and securely as possible

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Acceptance Criteria:

1. The user can add and update payment details at the checkout.
2. The user can add credit card details at the checkout.

Tasks:

• [x] Create checkout app
• [x] Create order model and order line item
• [x] Update Admin with new model and customise
• [x] Create signals to iterate through the shopping bag
• [x] Add order form
• [x] Create views for checkout
• [x] Create checkout template
• [x] Install crispy forms