update readme, hyper-link remain empty

README.md

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 # typora-theme-essay_cn
-a theme for Typora(a markdown editor), designed for chinese essay
+一个简单的、为中文课程论文排版设计的Typora主题。 | A theme for Typora(a markdown editor), designed for chinese essay.
+
+[详细介绍 | Detailed Introduction(chinese)]()
+
+## 安装 | Installation
+
+[可参见Typora官方文档 | see Typora docs](http://support.typora.io/About-Themes/)
+
+太长不看 | short version:
+
+0. [点此 | click here]()下载主题文件 | download theme
+
+1. 打开Typora偏好设置 |  File-Preference。（<kbd>Ctrl</kbd> +<kbd>,</kbd>）
+
+2. 外观-主题-打开主题文件夹  | Appearance-Themes-Open Theme Folder
+
+3. 将下载的essay.css文件放入此文件夹 |  move the downloaded file essay.css here
+
+4. 重启Typora，选取essay主题 | restart Typora, and select theme "essay"
+
+## 预览 | Preview
+
+![效果图]()