📝 README Updates (#24564)

README.md

@@ -32,6 +32,10 @@ To build Marlin 2.1 you'll need [Arduino IDE 1.8.8 or newer](https://www.arduino
   - [Installing Marlin (Arduino)](http://marlinfw.org/docs/basics/install_arduino.html)
   - [Installing Marlin (VSCode)](http://marlinfw.org/docs/basics/install_platformio_vscode.html).
 
+## Hardware Abstraction Layer (HAL)
+
+Marlin 2.0 introduced a layer of abstraction to allow all the existing high-level code to be built for 32-bit platforms while still retaining full 8-bit AVR compatibility. Retaining AVR compatibility and a single code-base is important to us, because we want to make sure that features and patches get as much testing and attention as possible, and that all platforms always benefit from the latest improvements.
+
 ### Supported Platforms
 
   Platform|MCU|Example Boards
@@ -45,6 +49,8 @@ To build Marlin 2.1 you'll need [Arduino IDE 1.8.8 or newer](https://www.arduino
   [STM32F103](https://www.st.com/en/microcontrollers-microprocessors/stm32f103.html)|ARM® Cortex-M3|Malyan M200, GTM32 Pro, MKS Robin, BTT SKR Mini
   [STM32F401](https://www.st.com/en/microcontrollers-microprocessors/stm32f401.html)|ARM® Cortex-M4|ARMED, Rumba32, SKR Pro, Lerdge, FYSETC S6, Artillery Ruby
   [STM32F7x6](https://www.st.com/en/microcontrollers-microprocessors/stm32f7x6.html)|ARM® Cortex-M7|The Borg, RemRam V1
+  [STM32G0B1RET6](https://www.st.com/en/microcontrollers-microprocessors/stm32g0x1.html)|ARM® Cortex-M0+|BigTreeTech SKR mini E3 V3.0
+  [STM32H743xIT6](https://www.st.com/en/microcontrollers-microprocessors/stm32h743-753.html)|ARM® Cortex-M7|BigTreeTech SKR V3.0, SKR EZ V3.0, SKR SE BX V2.0/V3.0
   [SAMD51P20A](https://www.adafruit.com/product/4064)|ARM® Cortex-M4|Adafruit Grand Central M4
   [Teensy 3.5](https://www.pjrc.com/store/teensy35.html)|ARM® Cortex-M4|
   [Teensy 3.6](https://www.pjrc.com/store/teensy36.html)|ARM® Cortex-M4|