Add Simplified Embedded Rust Book Links

The update entails adding links to both editions of the Simplified Embedded Rust book as an additional resource.

Author: apollolabsdev

README.md

@@ -139,6 +139,8 @@ In 2018, the Rust community created an embedded working group to help drive adop
 -   [Embedded Rust (std) on Espressif](https://docs.esp-rs.org/std-training/) - Training for Rust using std approach development on ESP32-C3 by Ferrous Systems.
 -   [Discovery](https://rust-embedded.github.io/discovery) by @rust-embedded — this book is an introductory course on microcontroller-based embedded systems that uses Rust as the teaching language. Original author: @japaric
 -   [Cortex-M Quickstart](https://docs.rs/cortex-m-quickstart/0.3.1/cortex_m_quickstart/) by @japaric – a template and introduction to embedded Rust, suitable for developers familiar with embedded development but new to embedded Rust.
+-   [Simplified Embedded Rust: Standard Library Edition](https://www.theembeddedrustacean.com/c/ser-std) - This book provides a quick path to start learning embedded Rust with minimal setup. Book is based on ESP devices and the Wokwi Simulator. This edition uses the standard library development approach which is based on the ESP-IDF framework.
+-   [Simplified Embedded Rust: Core Library Edition](https://www.theembeddedrustacean.com/c/ser-no-std) - This book provides a quick path to start learning embedded Rust with minimal setup. Book is based on ESP devices and the Wokwi Simulator. This edition uses the core library development approach for bare metal development.
 - [Writing an OS in Rust](https://os.phil-opp.com/) A blog series creating a small operating system in Rust
 -   [MicroRust](https://droogmic.github.io/microrust/) Introductory book for embedded development in Rust on the micro:bit.
 -   [Physical Computing With Rust](https://rahul-thakoor.github.io/physical-computing-rust/) A (WIP) guide to physical computing with Rust on the Raspberry Pi.