Gfx: A comparative table of HAL features available per backend

[snuk182]

It would be really nice to have an up to date table somewhere at the gfx-hal main page with list of the features that HAL currently provides, filled with their availability per backend, so end user is aware of what to expect.

[termhn]

Outline for completion:

• Look through the different backend implementations and look where there are any "TODO"s, unimplemented!()s, etc. and documenting in which functions they exist in
• Make a table of these unsupported features on different backends, probably in a markdown file in the info folder of the repo
• Link this document from the README

If you have questions or need help feel free to ping me on GitHub, Discord, or our Gitter (https://github.com/gfx-rs/gfx) :)

[galgalim]

Greetings, if no one is currently working on this issue, I'd like to start documenting the backends and drafting up the table.