Add crispy-bootloader

https://github.com/ADNTIO/crispy-bootloader-rp2040-rs

Author: 1NF04M3

README.md

@@ -1334,6 +1334,7 @@ Work in progress drivers. Help the authors make these crates awesome!
 1. [micromath](https://github.com/NeoBirth/micromath): Embedded Rust math library featuring fast, safe floating point approximations for common arithmetic operations, 2D and 3D vector types, and statistical analysis - [![crates.io](https://img.shields.io/crates/v/micromath.svg)](https://crates.io/crates/micromath)
 1. [miniconf](https://crates.io/crates/miniconf): Lookup/enumerate/serialize/deserialize nodes in trees of heterogeneous structs/arrays by path/key - [![crates.io](https://img.shields.io/crates/v/miniconf.svg)](https://crates.io/crates/miniconf)
 1. [minimq](https://crates.io/crates/minimq): A minimal MQTT5 client designed for no_std platforms - [![crates.io](https://img.shields.io/crates/v/minimq.svg)](https://crates.io/crates/minimq)
+1. [crispy-bootloader](https://github.com/ADNTIO/crispy-bootloader-rp2040-rs): Minimal dual-bank bootloader for RP2040 with USB firmware upload, A/B bank switching, and CRC verification.
 1. [moonboot](https://github.com/jhbruhn/moonboot): OTA Bootloader Construction Framework for Rust no_std environments, especially embedded devices without an OS
 1. [nalgebra](https://crates.io/crates/nalgebra): general-purpose and low-dimensional linear algebra library - [![crates.io](https://img.shields.io/crates/v/nalgebra.svg)](https://crates.io/crates/nalgebra)
 1. [nom](https://crates.io/crates/nom): parser combinator framework - [![crates.io](https://img.shields.io/crates/v/nom.svg)](https://crates.io/crates/nom)