Documentation: Add a note to import pico in your project after NPM install, for beginners.

[tauqeer1040]

Hi,
I don't think beginners can instinctively figure out how to apply Pico after an NPM install, throughout their project.
I figured how to apply pico via importing only by peeking around its react codepen examples.

Could we please add a tiny note just below the NPM installation instructions saying something like:

Don't forget to import "@picocss/pico" in your Main.jsx

Might help someone just starting out.