### What problem does this PR solve?

#1161 
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

- Update readme
- Add license

### Type of change

- [x] Documentation Update

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Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

### Type of change

- [x] Refactoring

### What problem does this PR solve?

### Type of change

- [x] Refactoring

Add naive chunking method to RAG

* clean rust version project

* clean rust version project

* build python version rag-flow

* format code

* use minio to store uploaded files; build dialog server;