Updated README with links to original source & boards

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 # Keyboard Featherwing in Rust
 
-This is a playground for working with @arturo182's Keyboard Featherwing in Rust.
+This is a playground for working with @arturo182's Keyboard Featherwing in Rust using the [Adafruit Feather M4 Express](https://www.adafruit.com/product/3857). It is ported from [@jamesmunns's original work](https://github.com/jamesmunns/keywing-rs) targeting the [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062).
 
-For now, I am using the adafruit nrf52840 express as the main MCU.