docs: added Traditional Chinese and French README files

README.md

@@ -1,4 +1,4 @@
-English | [简体中文](./README-zh_cn.md)
+English | [简体中文](./README-zh_cn.md) | [繁體中文](./README-zh_hant.md) | [Français](./README-fr.md)
 
 <div align="center">
   <img src="./public/logo.png" alt="K.G.Studio Logo" width="160" />
@@ -29,6 +29,8 @@ K.G.Studio is a lightweight, modern DAW that runs entirely in the browser with *
 
 ## Latest Updates
 
+- **2026.05.30**: Added **internationalization (i18n) support** — K.G.Studio now ships in four languages: **English**, **Simplified Chinese (简体中文)**, **Traditional Chinese (繁體中文)**, and **French (Français)**. The active language can be configured under **Settings ⚙️ → General → Language**, with an `Auto` option that automatically detects your browser's locale.
+
 - **2026.05.27**: 
   - Added **Global Track System** — introduce four global tracks: **Marker**, **Tempo**, **Key Signature**, and **Chord** (chord-symbol span regions). 
   - Added **Audio Chord Detection** feature — open piano roll window for an audio or a MIDI region and click "..." -> **Detect Chords** to automatically analyse the recording and populate the Chord Track using a zero-dependency FFT pipeline with configurable sensitivity, stability, and seventh-chord detection.