Initialize the project

-Comment out the redundant JS files in ```index.html```
-Fix the goods amount of shopping cart to ```0``` in ```cart.html```, ```items.html``` and ```payment.html```
-Delete the sample list of goods and fix the summation price of cart to ```0.00元``` in ```cart.html``` and ```payment.html```
Merge pull request #1 from SanCoder-Q/SanCoder

Initialize the project