docs: add demo for previewing lists

[bytrangle]

Hi. I've added a Codepen demo for previewing all the supported color lists in Color Names.

Features:

• Display names from all lists for five basic colors
• Users can change colors and the names will be updated on the spot

[meodai]

again, the API is over here: https://github.com/meodai/color-name-api this repository is only for the color-name list