[Migrated] Improve documentation to include visual of what example app should look like?

[rust-gpu-bot]

Issue automatically imported from old repo: EmbarkStudios/rust-gpu#1108
Old labels: t: enhancement
Originally creatd by JulianKnodt on 2023-12-16T19:14:48Z

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I was hoping to learn how to write rust-gpu shaders, so I was going through the tutorial, and have to run the CPU version on my old mac air.

I think for rendering, it may be useful to include images, as I'm not sure if this output looks correct:

Specifically it may be useful to include an image after the initial build steps to make sure that it's running correctly.