Update README.md to add USB Host/Device

[thejpster]

Thanks for submitting!

Category

Is this PR a:

• [x] New Not Yet Awesome item?
• [x] A WIP project addressing an open item?
• [ ] Removing a Not Yet Awesome item?

New Not Yet Awesome item checklist

• [x] Is the request clearly stated, linking to relevant documentation, such as a whitepaper, protocol definition, datasheet, etc.?
• [x] Are the "Success Criteria" defined?
• [x] Is this request possible using today's Rust (not blocked by LLVM impl, rustc impl, etc.)?
• [x] Is this request broken into reasonable work packages, such as "Create HAL for XYZ chip", not "support all boards from ABC vendor"?

WIP Project checklist

• [x] Is there a link to the source project on GitHub/GitLab/etc?
• [x] Is the project open source?
• [x] Is it clear if contributions are welcome?
• [x] Is the project relevant to the TODO item it addresses?
• [x] Is the project more than just an empty repo or a placeholder (e.g. just a "hello world" bin.rs/lib.rs)?

Remove an item checklist

• [ ] Has the project that fixes the item been mentioned in the PR?
• [ ] Does the project address the original request fully?
• [ ] Has the crate that addresses the request has been added to the Awesome Embedded Rust list?
• [ ] Has the crate has been published on crates.io (or somewhere else where other people can consume it)?

[rust-highfive]

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

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