Create a class Shop that can help shop owners keep track of their products!

Our class should have multiple functionality:

• initialize your shop with a random ID.

• add_product should take the name, price and stock of your product. Stock should be optional otherwise it counts as 1.

• sale should print out new prices for all your products based on the percentage you pass

  sale(50) #applies a 50% sale

• stock show the stock of your products

• purchase should take the name and amount of the purchased item. Then subtracts the amount of items you purchase from your stock, if your stock is empty, it gives a warning.

• show_products Displays all products information!

• remove_product takes a product name and removes that product from your shop list