Add Crispy Bootloader

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

Author: 1NF04M3

README.md

@@ -1431,6 +1431,7 @@ There are many ways to handle panics in embedded devices, these crates provide h
 - [Booster](https://github.com/quartiq/booster): Firmware for an RF power amplifier, including telemetry via MQTT and run-time configuration
 - [Thermostat EEM](https://github.com/quartiq/thermostat-eem): Firmware for a multi-channel temperature controller used in physics experiments
 - [Card/IO ECG](https://github.com/card-io-ecg/card-io-fw): Firmware for a business-card-sized ECG device with Wifi connectivity
+- [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. Includes Rust and C++ firmware samples.
 - [BillMock](https://github.com/pmnxis/billmock-app-rs): Firmware for credit card terminal add-on hardware to install on Korean arcade machines
 - [LuLuu](https://github.com/fu5ha/luluu): Firmware for a custom RP2040-based display controller that streams animated images from a microSD card to a small LCD display.
 - [prinThor](https://github.com/cbruiz/printhor): 3DPrinter/CNC/Engraver firmware framework powered by rust embassy for stm32 families and rp2040.