Adding the stm32h7xx-hal crate

[hargoniX]

I'm one of the co authors and I think with the release 0.2.0 which just came out the other day this HAL is now in a pretty solid and ready to use state.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @jamesmunns (or someone else) soon.

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[jamesmunns]

Hey @hargoniX, a couple quick comments/questions:

• You mention that beta or nightly is required in the readme, what's the reason for that? (I don't think we have a hard rule that crates have to be stable-only, but most are nowadays)
• The docs for your crate aren't currently building, due to a timeout on docs.rs. Based on the build logs, it seems your build is timing out, which is a thing that embedded crates do sometimes. There is a link there to open an issue and ask for a longer timeout so that you can get your builds fixed.

[hargoniX]

For the first question, our current README on GitHub removed that note but it was due to the type_alias_enum_variant feature gate which has been stabilized in 1.37, I'll look into why the README isn't up to date on crates.io

I'll look into that asap, thanks for pointing it out!

[hargoniX]

@jamesmunns Both of your concerns should be resolved now.

[jamesmunns]

Looks great, thanks for fixing those!

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push