add docs for custom dataset, reader and model technical (#2526)
* add docs for custom dataset, reader and model technical * modify docs according to review, test=document_fix * modify READER.md, test=document_fix
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docs/advanced_tutorials/READER.md
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docs/images/model_figure.png
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docs/images/reader_figure.png
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ppdet/data/tools/x2coco.py
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