* add doc for keypoint development

* fold examples

* some advice

* update ppdet docs & remove static code, test=document_fix

* add pphuman doc, test=document_fix

* update action doc, test=document_fix

* update activity, test=document_fix

* optimize pphuman action document

* add en doc

* update attr docs

* update more

* update docs

* attribute docs update

* fix mtmct

* update docs

* add pphuman mot doc, test=document_fix

* add mot data tutorials, test=document_fix

* add docs, still in working

* add action doc

* add action en doc

* add fight recognition docs

* add fight recognition tool file : split_fight_train_test_dataset.py

* fight recognition quick start and develop documents

* add solution selection table for action recognition.

* add fight recognition case AI Studio link

* refactor doc, test=document_fix

* update yolox & yolov5, test=document_fix

* Update README_cn.md

* update doc, test=document_fix

* Update readme and pphuman readme

* Update README.md

* add data & customize, test=document_fix

* update readme

* Update README_cn.md

* Update README_cn.md

* add template, test=document_fix
Co-authored-by: NYixinKristy <576550767@qq.com>