Add README documentation

README.md

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+# KV App - AI Video Flow
+
+AI-powered video creation app with workflow automation, TikTok trending analysis, and video generation.
+
+## Features
+
+- **AI Workflow Builder**: Create video workflows using AI agents (OpenCode, 34ai)
+- **TikTok Trending**: Browse and analyze trending TikTok videos by region
+- **Video Recreation**: Analyze trending videos and recreate with AI
+- **Settings Management**: Configure API keys and preferences
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 18+
+- npm or yarn
+
+### Installation
+
+```bash
+npm install
+```
+
+### Development
+
+```bash
+npm run dev
+```
+
+Open [http://localhost:3000](http://localhost:3000)
+
+### Build
+
+```bash
+npm run build
+npm start
+```
+
+## Configuration
+
+Go to **Settings** page to configure:
+
+- **OpenCode API Key**: Get from [opencode.ai](https://opencode.ai)
+- **34ai API Key**: Get from [34ai.net](https://34ai.net)
+
+## Tech Stack
+
+- Next.js 14
+- React 18
+- Tailwind CSS
+- Zustand (state management)
+- React Flow (workflow builder)
+
+## Project Structure
+
+```
+app/
+├── api/
+│   ├── opencode/     # OpenCode AI proxy
+│   └── tiktok/       # TikTok trending API
+├── settings/         # Settings page
+├── shop/            # Shop page
+├── trending/        # TikTok trending page
+├── upload/          # Upload page
+└── page.tsx         # Main home page
+
+components/
+├── Header.tsx       # Navigation header
+└── tabs/
+    └── CreateTab.tsx
+
+lib/
+├── api/
+│   ├── api34ai.ts  # 34ai API client
+│   └── opencode.ts  # OpenCode API client
+├── context/
+│   └── SettingsContext.tsx
+└── types/
+    └── index.ts
+```
+
+## License
+
+MIT