Updating README with instructions on how to access a UART shell on the device

[jamiejones85]

Updating README with instructions on how to access a UART shell on the device

Summary by Sourcery

Add instructions to the README for accessing a UART shell on the device by modifying the startup script, wiring the RX/TX/GND pins on the unpopulated PCB connector, and disabling the desktop module load.

Documentation:

• Add step-by-step instructions in README for UART shell access by commenting out the desktop.mod insmod in startup.sh and flashing the firmware
• Describe the unpopulated PCB connector pin mapping (GND, TX, RX) with a sample image

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Enhanced README with detailed UART shell access instructions, including startup script modification, PCB pin wiring guidance with image support, and notes on desktop app behavior.

File-Level Changes

Change	Details	Files
Documented startup script adjustment for UART shell access	Added step to comment out "insmod d:\apps\desktop.mod" in startup.sh Noted rebuild and flash requirement to prevent desktop.mod from occupying UART	README.md
Provided PCB UART connector wiring guide	Described unpopulated PCB connector with RX, TX, and GND pins Mapped pin colors (Orange=GND, Black=TX, Green=RX) Embedded sample image illustrating connector location	README.md
Clarified desktop app behavior and example insmod usage	Mentioned that the desktop app will no longer auto-run after modification Included example insmod command for manual module insertion	README.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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