Update: README.md

Add MIT license

Remove docs/ placeholder note

Add README screenshot and prebuilt Windows binaries

Initial commit: StaySerial serial terminal

Translate README to English

Update screenshot to reflect the new UI

Add v0.3 release binary to bin/

Redesign UI as a card-based modern layout, drop manual baud selection

Add versioned release binaries to bin/

Fix progress bar and chip info display, add multi-file (bootloader/partition/app) flashing

Update: README.md

Update: README.md

Add MIT license

Remove ZIP mention from README

Fix 4th screenshot: settings, not compass

Add app screenshots

Rewrite README: concise, pet project voice, highlight expertise