Add nucleo-f401re to board section

Author: jkristell

README.md

@@ -343,11 +343,14 @@ Crates tailored for specific boards.
 
 - [`nucleo-f042k6`](https://github.com/therealprof/nucleo-f042k6.git) - [Nucleo-F042K6]
 - [`nucleo-f103rb`](https://github.com/therealprof/nucleo-f103rb.git) - [Nucleo-F103RB]
+- [`nucleo-f401re`](https://github.com/jkristell/nucleo-f401re.git) - [Nucleo-F401RE] ![crates.io](https://img.shields.io/crates/v/nucleo-f401re.svg)
 - [`f3`](https://crates.io/crates/f3) Board Support Crate for the [STM32F3DISCOVERY] - ![crates.io](https://img.shields.io/crates/v/f3.svg)
 - [`stm32f407g-disc`](https://crates.io/crates/stm32f407g-disc) Board Support Crate for the [STM32F4DISCOVERY] (WIP) - ![crates.io](https://img.shields.io/crates/v/stm32f407g-disc.svg)
 - [`stm32f429i-disc`](https://crates.io/crates/stm32f429i-disc) Board Support Crate for the [STM32F429DISCOVERY] (WIP) - ![crates.io](https://img.shields.io/crates/v/stm32f429i-disc.svg)
 - [`solo-bsp`](https://crates.io/crates/solo-bsp) Board Support Crate for [Solo], an open source security token (WIP) - ![crates.io](https://img.shields.io/crates/v/solo-bsp.svg)
 
+[Nucleo-F401RE]: https://www.st.com/en/evaluation-tools/nucleo-f401re.html
+
 ### Texas Instruments
 
 - [`stellaris-launchpad`](https://crates.io/crates/stellaris-launchpad) - For the Texas Instruments Stellaris Launchpad and Tiva-C Launchpad ![crates.io](https://img.shields.io/crates/v/stellaris-launchpad.svg)