Propose taking over embedded-hal-async

rfcs/0000-embedded-hal-async.md

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+- Feature Name: Take over embedded-hal-async
+- Start Date: 2021-12-20
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+
+The HAL team of the Rust Embedded WG takes over the crate `embedded-hal-async`.
+
+# Motivation
+[motivation]: #motivation
+
+The `embedded-hal-async` crate has been created to serve as a central place for developing
+asynchronous versions of the `embedded-hal` traits.
+Given the interest from many members of the community, it would be useful to pursue
+this in a centralized fashion like `embedded-hal`.
+
+# Detailed design
+[design]: #detailed-design
+
+@eldruin performs whichever small adaptions necessary and transfers the repository
+to the rust-embedded organization.
+
+# How We Teach This
+[how-we-teach-this]: #how-we-teach-this
+
+We add a link to the `embedded-hal-async` repository in `embedded-hal` and in its
+GitHub issues which refer to asynchronous matters.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+Additional maintenance burden.
+
+# Alternatives
+[alternatives]: #alternatives
+
+1. Keep this crate outside of the WG.
+2. Split the `embedded-hal` repository in-place: https://github.com/rust-embedded/embedded-hal/pull/334
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+None.
+
+[`embedded-hal-async`]: https://github.com/eldruin/embedded-hal-async