chore: update readme for shorting instruction

[kienvo]

How to flash without a soldering iron.

Summary by Sourcery

Update README to improve flashing instructions without soldering by adding an alternative C3 shorting method, a dmesg verification step, and an illustrative diagram asset.

Documentation:

• Add alternative ISP entry method by shorting the C3 capacitor instead of disconnecting the battery
• Add instructions to verify ISP mode via dmesg output (idVendor=4348, idProduct=55e0)
• Include burn-badge.svg diagram asset to illustrate the shorting procedure

[sourcery-ai]

Reviewer's Guide

Extended README flashing instructions to provide two methods for entering the bootloader (battery‐disconnect or C3 capacitor short) and added a visual asset to illustrate the process.

File-Level Changes

Change	Details	Files
Enhanced bootloader entry instructions with alternative shorting method	Replaced single battery-disconnect approach with two bootloader-entry options Added steps to short and release C3 capacitor while holding KEY2 Guided user to verify ISP mode via dmesg with idVendor/idProduct	README.md
Introduced visual diagram for flashing process	Added burn-badge.svg asset Embedded the image reference into the flashing instructions	assets/burn-badge.svg README.md

Possibly linked issues

• Replace MounRiver with ch32fun - thanks @biemster #123: PR adds alternative flashing method by shorting C3, addressing the battery disconnect question in the issue.

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[samruddhi-Rahegaonkar]

Yes, it’s working. I’ve tested it successfully.

[nope3472]

I have not recieved the badge yet so i cant test it from my side.