docs: expand README

README.md

@@ -1,15 +1,83 @@
-# podcast-generator
+# Voice RSS Summary
 
-To install dependencies:
+Voice RSS Summary automatically collects RSS feeds, summarizes new articles using OpenAI, and publishes them as a podcast with speech synthesized by VOICEVOX. The project uses the Bun runtime with a React (Vite) front end and an SQLite database.
+
+## Features
+
+- Fetch multiple RSS feeds listed in `feed_urls.txt`.
+- Generate podcast scripts with the OpenAI API.
+- Convert scripts to audio using VOICEVOX and FFmpeg.
+- Serve a web interface to browse feeds and play episodes.
+- Provide a podcast RSS feed at `/podcast.xml`.
+
+## Prerequisites
+
+- [Bun](https://bun.sh/) 1.x (if running locally)
+- VOICEVOX engine
+- An OpenAI API key
+
+## Installation
+
+1. Install dependencies:
 
    ```bash
    bun install
    ```
 
-To run:
+2. Build the front end:
 
    ```bash
-bun run 
+   bun run build:frontend
    ```
 
-This project was created using `bun init` in bun v1.2.15. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
+3. Create a `.env` file and set the following variables:
+
+   ```env
+   OPENAI_API_KEY=your-api-key
+   OPENAI_API_ENDPOINT=https://api.openai.com/v1
+   OPENAI_MODEL_NAME=gpt-4o-mini
+   VOICEVOX_HOST=http://localhost:50021
+   VOICEVOX_STYLE_ID=0
+   PODCAST_TITLE=Voice RSS Summary
+   PODCAST_LINK=https://your-domain.com/podcast
+   PODCAST_DESCRIPTION=Generated podcast feed
+   PODCAST_LANGUAGE=ja
+   PODCAST_AUTHOR=Admin
+   PODCAST_CATEGORIES=Technology
+   PODCAST_TTL=60
+   PODCAST_BASE_URL=https://your-domain.com
+   FEED_URLS_FILE=feed_urls.txt
+   ```
+
+4. Prepare `feed_urls.txt` with one RSS feed URL per line.
+
+5. Start the server:
+
+   ```bash
+   bun run server.ts
+   ```
+
+The initial batch process runs on start and then every 24 hours.
+
+## Docker
+
+A Dockerfile and helper scripts are provided. To run in a container:
+
+```bash
+./build-docker-image.sh
+./run-docker.sh
+```
+
+These scripts mount `feed_urls.txt`, `.env`, `public/`, and `data/` for persistence.
+
+## Directories
+
+- `data/` – SQLite database (`podcast.db`)
+- `public/podcast_audio/` – generated MP3 files
+- `frontend/` – Vite React application (served on build)
+
+Access the web UI and podcast feed on `http://localhost:3000/` after the server starts.
+
+## License
+
+This project is licensed under the [Apache 2.0 License](LICENSE).