Included car data from carData.php in cars.php

Included the car data from carData.php in cars.php. The array is then
displayed using the print_r() method.
Created Car class with constructor

Created Car class with a constructor for all the properties. The
properties are private so they cannot be messed with by anything else.
Relocated part e. code to the correct place

Relocated part e. code to the correct place and removed the placeholder.
Created loop to create cars and store in array

Created a foreach loop to create car objects and store them in a cars
array. Removed the unused print_r call.
Added loop to create adverts for each of the cars

Added a foreach loop to create adverts for each of the cars. Also added
getter methods to the Car class to access the properties and some css to
make it look nice.
Created a getAge method and added it to cars.php

Created a getAge method to calculate the age of the car, from the
registration year and the current date. Replaced 'Year' with 'Age' in
cars.php.
Added a property that holds the GET colour

Added a property called '$colour' that holds the GET colour. Echo it to
show its working (will be removed later).
Added a colour check and fixed the reset bug

Added a check to show the cars with the selected colour and added a
check to deal with the case where there is no colour selected.