### What problem does this PR solve?

Add get_txt function to reduce duplicate code

### Type of change

- [x] Refactoring

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Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### 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>

* init README of deepdoc, add picture processer.

* add resume parsing