* refaictor CONTRIBUDING.MD
* refaictor CONTRIBUDING.MD
* fix source rvm shell command
* fix lint
* add chinese contributing.md
* fix error render
* fix error render
* refine description
* refine description
* minor refine
* install ffmpeg before ut
* Minor retfine
* Minor refine
* refine chinese contributing.md
* Refine
* Fix as comment
* Fix as comment
* restore pr.md
* minor refine
* minor refine
* update chinese CONTRIBUTING.md in root dir
* adjust imgae size
* update en CONTRIBUTING.md
* update en CONTRIBUTING.md
* update contributing.md in docs
* restore change of index.rst
* Fix as comment
* minor refine
* remove content in PR.md
* minor refine
* minor refine
* minor refine
* Fix as comment
* rename
* minor refine
Mashiro