Added Example on p5.Framebuffer.get method

[Forchapeatl]

Resolves #6750

Changes:

Screenshots of the change:

https://editor.p5js.org/forchapearl1/sketches/QilKPDTvv

PR Checklist

• [x] npm run lint passes
• [x] Inline documentation is included / updated
• [ ] Unit tests are included / updated

[perminder-17]

Hi, Great work so far. Thanks for your work @Forchapeatl and also thanks for the review @davepagurek I do have some thoughts on this. Let me know what you feel?

The sketch on the reference page looks a bit off. The canvas is 100x100, and we're trying to draw a box of the same size, also it seems slightly shifted or translated. I do have some thoughts on this.