docs: rewrite README in English (v5.0.1)

README.md

@@ -1,66 +1,77 @@
+# ☁️ CloudNote - End-to-End Encrypted Cloud Notes Client
 
-☁️ CloudNote - 端到端加密云笔记客户端
+A privacy-focused desktop cloud note application using **AES-256-GCM + X25519 elliptic curve encryption** for true end-to-end encryption. The server only stores encrypted data and cannot decrypt user note content.
-====================================
 
-一个注重隐私保护的桌面云笔记应用程序，采用 AES-256-GCM + X25519 
+---
-椭圆曲线加密，实现真正的端到端加密。服务器仅存储加密数据，
-无法解密用户笔记内容。
 
-✨ 核心特性
+## ✨ Core Features
------------
-✓ 端到端加密 - 笔记在本地加密后上传，服务器永不见明文
-✓ 混合加密体系 - X25519密钥交换 + AES-256-GCM对称加密
-✓ 灵活密钥管理 - 支持全局密钥/单文件密钥/密码保护三种模式
-✓ 双因素保护 - 可同时使用密码+单独密钥文件保护敏感笔记
-✓ 零知识架构 - 服务器不存储任何解密密钥
-✓ 跨平台支持 - Windows/Linux/macOS
 
-🔐 加密算法
+| Feature | Description |
------------
+|---------|-------------|
-- 密钥交换: X25519 (椭圆曲线Diffie-Hellman)
+| ✓ End-to-End Encryption | Notes are encrypted locally before upload; the server never sees plaintext |
-- 对称加密: AES-256-GCM (认证加密)
+| ✓ Hybrid Encryption | X25519 key exchange + AES-256-GCM symmetric encryption |
-- 非对称加密: RSA-2048 (可选)
+| ✓ Flexible Key Management | Global key / per-file key / password protection modes |
-- 密钥派生: PBKDF2 (100,000次迭代)
+| ✓ Two-Factor Protection | Combine password + separate key file to protect sensitive notes |
+| ✓ Zero-Knowledge Architecture | The server stores no decryption keys |
+| ✓ Cross-Platform | Windows / Linux / macOS |
 
-🛠️ 技术栈
+---
------------
-- 语言: Python 3.8+
-- GUI框架: PyQt5
-- 加密库: cryptography
-- 网络请求: requests
 
-🛡️ 安全原则
+## 🔐 Encryption Algorithms
------------
-1. 信任无需要 - 服务器默认不可信
-2. 密钥属用户 - 所有密钥仅存在于客户端
-3. 加密在本地 - 明文永不离开用户设备
-4. 开源可验证 - 代码完全开源，接受安全审计
 
-📄 许可证
+- **Key Exchange**: X25519 (Elliptic Curve Diffie-Hellman)
----------
+- **Symmetric Encryption**: AES-256-GCM (Authenticated Encryption)
-Apache License 2.0
+- **Asymmetric Encryption**: RSA-2048 (optional)
+- **Key Derivation**: PBKDF2 (100,000 iterations)
+
+---
+
+## 🛠️ Tech Stack
+
+- **Language**: Python 3.8+
+- **GUI Framework**: PyQt5
+- **Encryption Library**: cryptography
+- **HTTP Client**: requests
+
+---
+
+## 🛡️ Security Principles
+
+1. **Trust Not Needed** — The server is untrusted by default
+2. **Keys Belong to User** — All keys exist only on the client
+3. **Encrypt Locally** — Plaintext never leaves the user's device
+4. **Open Source Verifiable** — Fully open source, open to security audit
+
+---
+
+## 📄 License
+
+This project is licensed under the **Apache License 2.0**.
+
+---
+
+## 👤 Author
 
-👤 作者
--------
 dvsxt
 
-🔗 仓库地址
+## 🔗 Repository
------------
+
 https://gitcode.com/dvsxt/cloudnote
 
+---
 
-## 🎵 致音乐爱好者
+## 🎵 For Music Lovers
 
-> *写笔记时想听点音乐？试试我的另一个项目——*
+> *Want to listen to some music while taking notes? Try my other project —*
 
-### 🔊 ap_ds · 轻量级 Python 音频革命
+### 🔊 ap_ds · The Lightweight Python Audio Revolution
 
-**2.5MB** 终结 FFmpeg **160MB** 的臃肿时代
+**2.5MB** ends the era of FFmpeg's **160MB** bloat
 
-- 🎵 支持 MP3 / FLAC / OGG / WAV
+- 🎵 Supports MP3 / FLAC / OGG / WAV
-- ⚡ 非阻塞播放，完美适配 GUI 应用
+- ⚡ Non-blocking playback, perfect for GUI apps
-- 📦 零依赖，纯 Python 调用
+- 📦 Zero dependencies, pure Python
-- 🔒 v3.0 LTS 长期支持，永久免费
+- 🔒 v3.0 LTS long-term support, free forever
 
 ```bash
 pip install ap_ds
@@ -69,21 +80,9 @@ pip install ap_ds
 ```python
 from ap_ds import AudioLibrary
 lib = AudioLibrary()
-lib.play_from_file("灵感配乐.mp3")  # 边写笔记边听歌
+lib.play_from_file("inspiration.mp3")  # listen while taking notes
 ```
 
-👉 [了解 ap_ds 详情](https://gitcode.com/dvsxt/ap_ds)
+👉 [Learn more about ap_ds](https://gitcode.com/dvsxt/ap_ds)
 
-*同一作者出品，同样坚持：轻量、安全、纯粹。*
+*From the same author, with the same values: lightweight, secure, pure.*
-
-
-   ☁️  CloudNote v1.0
-   端到端加密云笔记
-
-📦 作者: dvsxt
-📄 许可证: Apache 2.0
-🔗 https://gitcode.com/dvsxt/cloudnote
-
-🎵 推荐我的项目: ap_ds
-   2.5MB 极简音频播放库
-   https://gitcode.com/dvsxt/ap_ds