Added device-driver crate

I've made a crate that can help you create device drivers. Currently it can only be used for register definitions, but I'm planning on doing more.
I'd love to get some more eyeballs on this and adding it to this list seems like a good step.

README.md

@@ -872,6 +872,7 @@ Work in progress drivers. Help the authors make these crates awesome!
 1. [`cmim`], or Cortex-M Interrupt Move: A crate for Cortex-M devices to move data to interrupt context, without needing a critical section to access the data within an interrupt, and to remove the need for the "mutex dance" - ![crates.io](https://img.shields.io/crates/v/cmim.svg)
 1. [dcmimu]: An algorithm for fusing low-cost triaxial MEMS gyroscope and accelerometer measurements ![crates.io](https://img.shields.io/crates/v/dcmimu.svg)
 1. [debouncr]: A simple no-std input debouncer to detect rising/falling edges with minimal RAM requirements. ![crates.io](https://img.shields.io/crates/v/debouncr.svg)
+1. [device-driver]: A toolkit to write better device drivers, faster. ![crates.io](https://img.shields.io/crates/v/device-driver.svg)
 1. [embedded-crc-macros](https://crates.io/crates/embedded-crc-macros): Macros implementing portable CRC algorithms and build-time lookup table generation. ![crates.io](https://img.shields.io/crates/v/embedded-crc-macros.svg)
 1. [embedded-websocket](https://crates.io/crates/embedded-websocket): A lightweight server and client websocket library for embedded systems. ![crates.io](https://img.shields.io/crates/v/embedded-websocket.svg)
 1. [endian_codec]: (En/De)code rust types as packed bytes with specific order (endian). Supports derive. - [![crates.io](https://img.shields.io/crates/v/endian_codec.svg)](https://crates.io/crates/endian_codec)
@@ -909,6 +910,7 @@ Work in progress drivers. Help the authors make these crates awesome!
 [biquad]: https://crates.io/crates/biquad
 [dcmimu]: https://crates.io/crates/dcmimu
 [debouncr]: https://crates.io/crates/debouncr
+[device-driver]: https://crates.io/crates/device-driver
 [endian_codec]: https://crates.io/crates/endian_codec
 [menu]: https://github.com/thejpster/menu
 [pc-keyboard]: https://github.com/thejpster/pc-keyboard