Add cargo-dfu tool

Author: Dblm0

README.md

@@ -158,6 +158,7 @@ In 2018 the Rust community created an embedded working group to help drive adopt
 -   [cargo-hf2](https://github.com/jacobrosenthal/hf2-rs)  A small cargo subcommand to download cargo builds to Microsoft UF2 bootloaders via HID USB . - ![crates.io](https://img.shields.io/crates/v/cargo-hf2.svg)
 -   [cargo-bloat](https://github.com/RazrFalcon/cargo-bloat) Find out what takes most of the space in your executable.
 -   [cargo-call-stack](https://crates.io/crates/cargo-call-stack) Static, whole program stack usage analyzer.
+-   [cargo-dfu](https://crates.io/crates/cargo-dfu) Cargo extension for flashing embedded rust programs via DFU.
 -   [uf2](https://github.com/sajattack/uf2conv-rs) Converts binary files to Microsoft's UF2 format for copying over to mass storage device uf2 bootloaders - ![crates.io](https://img.shields.io/crates/v/uf2.svg)
 -   [Knurling Tools](https://knurling.ferrous-systems.com/tools/) are developed by [Ferrous Systems] to ease the development process for building, debugging, and testing embedded Rust systems. These tools include:
     - [Probe Run](https://github.com/knurling-rs/probe-run): a cargo runner to flash and run embedded applications just like you would native applications, including backtraces and panicking behavior