~pcein/max7219-pico-rust

Drive an 8x8 LED matrix using MAX7219 and a Raspberry Pi Pico, with Rust 
Some cleanups
First commit

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#Use MAX7219 to interface a Raspberry Pico with 8x8 LED display

Rust translation of: https://github.com/riyas-org/max7219/tree/master/max7219-rpi, running on a Raspberry Pi Pico board.