AJAX and PHP code added

Added ajax function (line 114) to attempt dynamic data retrieval for a
single donut chart test. Added get_chart_data.php file that determines
what region was clicked and sets arrays for new data sets. Removed
setup and startup of line and bar charts for testing purposes. Can now
return country clicked, but can’t update data values. Parsing error on
line 7 of get_chart_data.php.
Added ReadMe

ReadMe file now including statement about this branch.
Added Commenting

Added comments to get_chart_data.php to help better understand the
backend.
Removed hardcoded data

Commented out the original hardcoded data values used in initial
testing. Fixed comment wording in PHP file.
Added AJAX data for chart

Added AJAX code and get_chart_data.php to dynamically change the donut
chart data based on clicked region.
Merge branch 'AJAX-data'

Conflicts:
	README.md