Cash Register 3 - read file, create hash, display transaction

display transaction method:
 1) displays the items that are for sale, with the price
 2) uses a for loop
 3) will add as many items as are in the CSV file
 4) includes the "Complete Sale" option

read file method:
 1) reads a CSV file
 2) uses a .foreach loop to read the file
 3) in the .foreach loop, creates a hash with 3 specified columns
 4) creates an array of hashes, and returns it