Add Douyin video downloader with auto-cookie feature

GUI/README-EN.md

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+# TKMGUI V2.1.1
+**Currently, only for the development of the preview version**
+
+![mit](https://img.shields.io/badge/license-MIT-blue)![python: v3.8.5](https://img.shields.io/badge/python-v3.8.5-green)![pyqt](https://img.shields.io/badge/Qt5-v5.14.3-red)<a target="_blank" href="http://mail.qq.com/cgi-bin/qm_share?t=qm_mailme&email=PFZTVFJPWU5aEU9ZWVh8WlNEUV1VUBJfU1E" style="text-decoration:none;"><img src="http://rescdn.qqmail.com/zh_CN/htmledition/images/function/qm_open/ico_mailme_11.png"/></a>
+
+[English](README-EN.md) [简体中文](README.md)
+
+![preview](https://tvax1.sinaimg.cn/large/006908GAly1gytdof69rrj30p00godhe.jpg)
+