Add Sprig as Canvas resource
Description
This change adds Sprig as a resource on the Canvas page.
Motivation
At Hack Club, a nonprofit, we recently published an open source game engine (with companion open source hardware) for people getting started with game dev in JavaScript called Sprig. A lot of the code for it is written by teenage hackers and the engine, editor, and hardware are entirely open source: https://github.com/hackclub/sprig
100+ games have already been built in it by beginner coders. This is a zombie game and one teenager even built a 3D raycasted game in it.
It's a great way for new coders to get started with game dev, and I wanted to suggest adding it as a resource on MDN's Canvas page. I think it's a lot more beginner friendly than some of the other libraries linked, and a great starting off point for newer coders reading the page.
I completely understand if it's not a good resource for the page, or if there's a conflict because I work at Hack Club, which created this!