### What problem does this PR solve?
#474 

### Type of change

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

### What problem does this PR solve?

#384

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?

Issue link:#264
### Type of change


- [x] Documentation Update
- [x] Refactoring

### What problem does this PR solve?

Issue link:#289

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Issue link:#289
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

* add use layout or not option

* trival

* init README of deepdoc, add picture processer.

* add resume parsing

Add naive chunking method to RAG