revise README.md

complete README.md

display all active products after adding & deleting product from database

polishing: made chosenItem/itemToUpdate/itemToDelete into objects instead of arrays; updated manager table to also display items in stock for each product

converted dept display to table, fixed visual details

fixed bug where product_sales wasn't updating with new purchases

add cli-table package & display items via table

add view depts, create dept & delete dept functionality

first attempt bamazonSupervisor

update product_sales for every purchase; add deparments table to database

added delete product functionality

add to inventory working

view active products & view low inventory working

initial setup & display menu prompt

working code (finished challenge #1: customer view)