Add selling price & product price

[anantjain6]

Currently, admin adds the price of product and user places order over that price

Rename the current "price" as "selling price"

Add new column "product price"

Example: A product's price is Rs 100 and the seller is selling it at a selling price of Rs 90

In admin panel following changes are required:-

1. Appropriate fields in add and edit product form
2. Show product price in all product table

In user (or buyer) panel following changes are required:-

1. Before placing the order show the price of the product as strike over product price followed by selling price