Add axum-handle-error-extract crate (#468)

* Add `axum-handle-error-extract` crate

* fixup

* Fix readme link

* Add `HandleErrorExt` for new error handling middleware

* Revert "fixup"

This reverts commit 83e04954df.

axum-handle-error-extract/README.md

@@ -0,0 +1,45 @@
+# axum-handle-error-extract
+
+Error handling layer for axum that supports extractors and async functions
+
+[![Build status](https://github.com/tokio-rs/axum-handle-error-extract/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/tokio-rs/axum-handle-error-extract/actions/workflows/CI.yml)
+[![Crates.io](https://img.shields.io/crates/v/axum-handle-error-extract)](https://crates.io/crates/axum-handle-error-extract)
+[![Documentation](https://docs.rs/axum-handle-error-extract/badge.svg)](https://docs.rs/axum-handle-error-extract)
+
+More information about this crate can be found in the [crate documentation][docs].
+
+## Safety
+
+This crate uses `#![forbid(unsafe_code)]` to ensure everything is implemented in
+100% safe Rust.
+
+## Minimum supported Rust version
+
+axum-handle-error-extract's MSRV is 1.54.
+
+## Getting Help
+
+You're also welcome to ask in the [Discord channel][chat] or open an [issue]
+with your question.
+
+## Contributing
+
+:balloon: Thanks for your help improving the project! We are so happy to have
+you! We have a [contributing guide][contributing] to help you get involved in the
+`axum` project.
+
+## License
+
+This project is licensed under the [MIT license][license].
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in `axum` by you, shall be licensed as MIT, without any
+additional terms or conditions.
+
+[docs]: https://docs.rs/axum-handle-error-extract
+[contributing]: /CONTRIBUTING.md
+[chat]: https://discord.gg/tokio
+[issue]: https://github.com/tokio-rs/axum/issues/new
+[license]: /axum/LICENSE