275: Add 1bitsy board support crate r=adamgreig a=dgoodlad

I've been working on a board support crate for the [1bitsy](https://1bitsy.org/) board, which is based on an STM32F415 MCU. The board is relatively simple, so there's only a few things to abstract:

* one LED
* one Button
* a 25MHz high-frequency external clock source

Co-authored-by: David Goodlad <david@goodlad.net>
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bors[bot] 2020-05-29 17:19:22 +00:00 committed by GitHub
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@ -387,6 +387,12 @@ Crates tailored for specific boards.
[STM32F4DISCOVERY]: https://www.st.com/en/evaluation-tools/stm32f4discovery.html [STM32F4DISCOVERY]: https://www.st.com/en/evaluation-tools/stm32f4discovery.html
[STM32F429DISCOVERY]: https://www.st.com/en/evaluation-tools/32f429idiscovery.html [STM32F429DISCOVERY]: https://www.st.com/en/evaluation-tools/32f429idiscovery.html
### 1BitSquared
- [`onebitsy`](https://crates.io/crates/onebitsy) - Board support crate for the [1bitsy] STM32F4-based board - ![crates.io](https://img.shields.io/crates/v/onebitsy.svg)
[1bitsy]: https://1bitsy.org/
### Adafruit ### Adafruit
- [`metro_m4`](https://crates.io/crates/metro_m4) - ![crates.io](https://img.shields.io/crates/v/metro_m4.svg) - [`metro_m4`](https://crates.io/crates/metro_m4) - ![crates.io](https://img.shields.io/crates/v/metro_m4.svg)