You can drop that file in your projects, change the namespace if you want.
The colors are from: https://tailwindcss.com/docs/customizing-colors#color-palette-reference, they were picked by a designer called Steve Schoger.
I find those colors useful for both debugging tools or in game colors.
The way it works, each colors have 10 shades. The shades are labeled
900. Lower numbers give you a lighter color, higher numbers give you a darker color. To draw, you pick a color and append a shade to it: