docs: 添加项目基础文件和文档

添加.gitignore文件管理忽略规则
添加中英文README文件说明项目结构和快速开始指南

README.md

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+# CE - MIXUI
+
+This is a Android project with MIXUI framework.
+
+## Project Structure
+
+- `app/` - Main application code
+- `libs/` - Third-party libraries
+- `build/` - Build outputs
+
+## Getting Started
+
+1. Open the project in Android Studio
+2. Build and run the application