This is a util library on top of MAX7219-crate that allows you to display
text on dot matrix displays. The main purpose of this lib is educational.
There aren't mappings for all chars yet! Feel free to contribute on github!
This definitely work's on Raspberry Pi. This is not no-std and won't work
on Arduino because it uses gpio_cdev-crate which uses linux character device driver
to access GPIO. Should work on other Linux powered devices with GPIO hardware too.
Feel free to learn from the code or to contribute!