Include example in which an SVG is loaded, modified, and exported

[golanlevin]

Working version here:
https://editor.p5js.org/golan/sketches/qn6EpSXiQ

This program:

• Loads an SVG file, using loadStrings() from p5.js v.1.11
• Parses it, with npm/svg-path-parser v.1.1.0
• Stores the SVG as an array of commands
• Also stores the SVG as an array of polyline coordinates
• Displays a design using the SVG
• Modifies the design (e.g. with randomness)
• Exports an SVG of the design, using p5.plotSvg.js v0.1.7