Elements for paddleocr output

[LaverdeS]

Some users of this pipeline are interested to know what elements are contained in the json output. As pointed in the save_ocr() method found on this blog, the elements are:

boxes = [line[0] for line in result]
txts = [line[1][0] for line in result]
scores = [line[1][1] for line in result]

The code has not been tested but these are the 3 elements that paddleocr library gives you.

Definition of Done:

• An element_type(or related name) is added to the json output as part of the pipeline. Re-generate API and update tests if necessary.
• Update README.md with a "pretty print" output of the new JSON structure.