Program which will produce an image in which each colour occurs exactly once -- with no repetition and no unused colours.
This is coding challenge given by EHG team during the hiring process.
-> run "npm install" inside project directory -> run "npm start" on the same directory
https://codegolf.stackexchange.com/questions/22144/images-with-all-colors
To save the image as png, right click on the image and click on "Save Image As"