usb: docs

embassy-usb/README.md

@@ -0,0 +1,22 @@
+# embassy-usb
+
+TODO crate description/
+
+## Interoperability
+
+This crate can run on any executor.
+
+## Minimum supported Rust version (MSRV)
+
+This crate requires nightly Rust, due to using "async fn in trait" support.
+
+## License
+
+This work is licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  <http://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.
+