worker.md

#### Worker

目前需分平台编写

- 微信小程序：[规范详情](https://developers.weixin.qq.com/miniprogram/dev/api/worker/wx.createWorker.html)
- 头条小程序：[规范详情](https://developer.toutiao.com/docs/game/worker/tt.createWorker.html)
- QQ小程序：[规范详情](https://q.qq.com/wiki/develop/miniprogram/API/worker/worker.html)