When looking into wgpu-rs as a replacement for WebGL I went to the
examples directory on GitHub to browse for a bit.
I wanted to see some of the examples at a glance without needing to
clone the repository.
This commit enables that by adding a README to each example with a
description of the example and screenshots / example output.
In a few cases the description is a bit redundant - but my hope is that
in the future we can improve all the READMEs.
Being a web API and thus very accessible, WebGPU could end up being many
people's first introduction to graphics programming so the lower we make
the barrier the better.
