docs(xhai_browser): Add Sea Browser Documentation

- Added README.md and README_cn.md files to introduce the features of Xiaohai Browser.
                    - Add screenshots of the browser UI.
                    - Updated .gitignore file to exclude IDE related configuration.

.gitignore

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+/.idea/

docs/xhai_browser/README.md

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+<img src="./assets/logo_512.png" width="64" height="auto" /> <img src="./assets/desktop_512.png" width="64" height="auto" /> 
+
+# [小海浏览器](https://m.malink.cn/s/7JFfIv)
+
+
+[小海浏览器](https://m.malink.cn/s/7JFfIv)是安卓桌面管理&AI浏览器,DeepSeek是默认AI对话引擎
+他有极致的性能(0.2秒启动),苗条的体型(apk 3M大),无广告,超高速广告拦截,多屏分类,屏幕导航,多搜索框,一框多搜
+
+
+## UI
+
+<img src="./assets/deepseek3-4t.jpg" width="360" height="auto" />
+<img src="./assets/deepseek3-4_2t.jpg" width="360" height="auto" />

docs/xhai_browser/README_cn.md

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+<img src="./assets/logo_512.png" width="64" height="auto" /> <img src="./assets/desktop_512.png" width="64" height="auto" /> 
+
+# [xhai Browser](https://m.malink.cn/s/7JFfIv)
+
+
+[xhai Browser](https://m.malink.cn/s/7JFfIv) is an Android desktop management & AI browser, DeepSeek is the default AI dialog engine.
+He has the ultimate performance (0.2 seconds to start), slim size (apk 3M), no ads, ultra-fast ad blocking, multi-screen classification, screen navigation, multi-search box, a box multiple search!
+
+xhai means "xiaohai" in Chinese, which means "extreme, high-performance, AI Browser" in English.
+
+## UI
+
+<img src="./assets/deepseek3-4t.jpg" width="360" height="auto" />
+<img src="./assets/deepseek3-4_2t.jpg" width="360" height="auto" />