Add p5.spirits library — interactive visual effects for p5.js

Author: Flourish216

src/content/libraries/en/p5.spirits.yaml

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+name: p5.spirits
+description: Interactive visual effects for p5.js — trails, bursts, glows, gravity fields, and noise flows in one line of code.
+category: animation
+sourceUrl: https://github.com/Flourish216/p5.spirits
+websiteUrl: https://flourish216.github.io/p5.spirits/
+featuredImage: ../images/p5.spirits.png
+featuredImageAlt: p5.spirits demo showing trail, burst, glow, gravity, and noise flow effects
+author:
+  - name: Jesse Zhang
+    url: https://github.com/Flourish216
+license: MIT