293: Add Adafruit-7segment Driver r=adamgreig a=kallemooo
I published a driver for Adafruit 7-segment LED Alphanumeric Backpack.
Co-authored-by: Karl Thorén <6556005+kallemooo@users.noreply.github.com>
1. [ST7789] - SPI - An embedded-graphics compatible driver for the popular lcd family from Sitronix used in the PineTime watch [github][44] ![crates.io](https://img.shields.io/crates/v/st7789.svg)
1. [DW1000] - SPI - Radio transceiver (IEEE 802.15.4 and position tracking) - [Article][45] - ![crates.io](https://img.shields.io/crates/v/dw1000.svg)
1. [Adafruit-7segment] - I2C - Driver for Adafruit 7-segment LED Numeric Backpack based on the ht16k33 chip - [github][47] - ![crates.io](https://img.shields.io/crates/v/adafruit-7segment.svg)