- This PR adds `examples/leds_rust` to call NuttX POSIX APIs like `open()` and `ioctl()`, so that it blinks an LED
- The `leds_rust` app is also used for testing the GPIO and LED Drivers for Ox64 BL808 SBC and QEMU RISC-V Emulator in Google Summer of Code
- `leds_rust` be executed locally on Linux / macOS / Windows, by commenting out the first 2 lines of code
- The code is based on `examples/leds` in C, and `examples/hello_rust` in Rust
Co-Authored-By: Lup Yuen Lee <9960133+lupyuen@users.noreply.github.com>
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