添加 README.md 文件，包含项目要求、使用方法、输出说明和注意事项

README.md

@@ -0,0 +1,29 @@
+# rrx_resource
+
+## Requirements
+- Node.js 18+
+- Playwright: `npm install playwright`
+
+## Usage
+### Default workflow
+```bash
+node run.mjs "https://h5.rrx.cn/storeview/<page-id>.html"
+```
+
+### Remote Chrome DevTools (optional)
+```bash
+node run.mjs "https://h5.rrx.cn/storeview/<page-id>.html" --cdp http://127.0.0.1:9222
+```
+Or set:
+```bash
+export ENV_CDP=http://127.0.0.1:9222
+```
+
+## Output
+- Screenshot: `downloads/<date>-<title>-<page-id>/index.png`
+- Media files: `downloads/<date>-<title>-<page-id>/media/`
+- Source URLs: `downloads/<date>-<title>-<page-id>/urls.txt`
+
+## Notes
+- Viewport: 375×667 @ dpr 3
+- Only audio/video/image URLs are collected