Tomas Brunken

添加一份二次开发文档

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建议在项目的介绍中添加一份二开的指导章节，介绍一下架构，原理之类的

[Question]: Add Real-Time Search Suggestions in RAGFlow Search Interface

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### Self Checks - [x] I have searched for existing issues [search for existing issues](https://github.com/infiniflow/ragflow/issues), including closed ones. - [x] I confirm that I am using English to submit this...