Update README.md

README.md

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 - Automatically compresses chat history to support long conversations while also saving your tokens
 - I18n: English, 简体中文, 繁体中文, 日本語, Français, Español, Italiano, Türkçe, Deutsch, Tiếng Việt, Русский, Čeština, 한국어, Indonesia
 
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+![主界面](./docs/images/cover.png)
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 ## Roadmap
 
 - [x] System Prompt: pin a user defined prompt as system prompt [#138](https://github.com/Yidadaa/ChatGPT-Next-Web/issues/138)