add rss_translator docs

docs/rss_translator/README.md

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+<img src="https://raw.githubusercontent.com/rss-translator/RSS-Translator/main/core/static/favicon.ico" width="64" height="auto" /> 
+
+# [RSS Translator](https://rsstranslator.com/en/)
+
+RSS Translator is an open source, self-hosted application. Translates title or content, provides AI summaries and generates a new translated feed
+
+## UI
+
+![UI](assets/ui.png)
+
+
+## Integrate with Deepseek API
+
+![add_translator](assets/add_translator.png)
+![add_openai](assets/add_openai.png)

docs/rss_translator/README_cn.md

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+<img src="https://raw.githubusercontent.com/rss-translator/RSS-Translator/main/core/static/favicon.ico" width="64" height="auto" /> 
+
+# [RSS翻译器](https://rsstranslator.com/)
+
+一个开源、简洁、可自部署的RSS翻译器，可翻译标题/内容、AI总结，并输出翻译后的RSS订阅链接。
+
+## UI
+
+![UI](assets/ui.png)
+
+## 配置 deepseek API
+
+![add_translator](assets/add_translator.png)
+![add_openai](assets/add_openai.png)