docs: add musb to hardware driver list

Author: decaday

README.md

@@ -31,6 +31,9 @@ Hardware driver crates
 * [rp2040-hal](https://github.com/rp-rs/rp-hal) - device-driver implementation for the raspberry pi RP2040 microcontroller. Examples can be found
   in the various boards crates [here](https://github.com/rp-rs/rp-hal-boards).
 
+* [musb](https://github.com/decaday/musb) - device-driver implementation for musb (Mentor USB, USB2.0 IP), widely used in various microcontrollers and SoCs from vendors like TI, MediaTek, Puya, and Allwinner. 
+  Examples can be found in [py32-hal](https://github.com/py32-rs/py32-hal/tree/main/examples/usbd-f072).
+
 Class crates
 ------------