Document required system dependencies in README

[seabass-labrax]

• Add a subsection to README.md about the required system dependencies

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[seabass-labrax]

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Agreed to by Sebastian Crane seabass-labrax@gmx.com on 2023-04-29

[dragostis]

Thank you for the patch.

Not completely sure why the font/cmake dependencies would be needed for the library itself. Does wgpu pull these dependencies along with it?

[seabass-labrax]

The font/cmake dependencies come in via winit, but are only needed for the demos. I've updated this patch to make that clearer :)

[dragostis]

Thank you for clearing that up! :) It looks like the CLA check is still failing.