Continue with SoftwareOrder program from chapter 6 that has 2 files,
softwareOrder7.html and softwareOrder7.php. The code in SoftwareOrder7.html
does not need to be changed. The PHP program should test the number of copies
orderd. If there are less than five copies the shipping and handling charge is a
standard 3.50 no matter how many copies, otherwise the shipping handling is 0.75
for each copy