350: Add port-expander crate r=eldruin a=Rahix

A crate I published some time ago which might be useful to get out there... See <https://github.com/Rahix/port-expander> or the [blog post](https://blog.rahix.de/port-expander/) for more details.

Co-authored-by: Rahix <rahix@rahix.de>
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bors[bot] 2021-12-16 07:31:39 +00:00 committed by GitHub
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@ -610,6 +610,7 @@ have achieved the "released" status (published on crates.io + documentation / sh
1. [MCP794xx] - I2C - Real-time clock / calendar driver - [Intro blog post][26] - ![crates.io](https://img.shields.io/crates/v/mcp794xx.svg)
1. [MMA7660FC] - I2C - 3-axis accelerometer - [Intro blog post][9]
1. [OPT300x] - I2C - Ambient light sensor family driver - [Intro blog post][30] - ![crates.io](https://img.shields.io/crates/v/opt300x.svg)
1. [port-expander] - I2C - Driver for I2C port expanders (supports `PCA95xx`, `PCF85xx`) - [Intro blog post][58] - ![crates.io](https://img.shields.io/crates/v/port-expander.svg)
1. [pwm-pca9685] - I2C - 16-channel, 12-bit PWM/Servo/LED controller - [Intro blog post][32] - ![crates.io](https://img.shields.io/crates/v/pwm-pca9685.svg)
1. [rainbow-hat-rs] - I2C/SPI/GPIO - Pimoroni Rainbow HAT driver for Raspberry Pi - [github][57] - ![crates.io](https://img.shields.io/crates/v/rainbow-hat-rs.svg)
1. [rotary-encoder-hal] - GPIO - A rotary encoder driver using `embedded-hal` - [Intro blog post][28] - ![crates.io](https://img.shields.io/crates/v/rotary-encoder-hal.svg)
@ -696,6 +697,7 @@ have achieved the "released" status (published on crates.io + documentation / sh
[55]: https://barafael.github.io/A-Platform-Agnostic-Driver-for-the-CD74HC4067
[56]: https://barafael.github.io/A-Platform-Agnostic-Driver-for-the-HC12-serial-radio-module/
[57]: https://github.com/yannart/rainbow-hat-rs
[58]: https://blog.rahix.de/port-expander/
[AD983x]: https://crates.io/crates/ad983x
[adafruit-alphanum4]: https://crates.io/crates/adafruit-alphanum4
@ -729,6 +731,7 @@ have achieved the "released" status (published on crates.io + documentation / sh
[MCP794xx]: https://crates.io/crates/mcp794xx
[MMA7660FC]: https://crates.io/crates/mma7660fc
[OPT300x]: https://github.com/eldruin/opt300x-rs
[port-expander]: https://crates.io/crates/port-expander
[pwm-pca9685]: https://crates.io/crates/pwm-pca9685
[rainbow-hat-rs]: https://crates.io/crates/rainbow-hat-rs
[rotary-encoder-hal]: https://crates.io/crates/rotary-encoder-hal