[Docs] Update Contributing Guide

[sunshinemingo]

We need to update contributing guide because the project was renamed.

[frank-zsy]

Not only because rename but also need thorough document for developers to understand how the project works and how to develop and test in local environment.

[wengzhenjie]

In which directory can we add local development and testing document？

[frank-zsy]

We don't have the document of local development and testing right now, I will add to document later.

[frank-zsy]

/self-assign

[TieWay59]

Is this local development and testing document still on the schedule?

[frank-zsy]

Is this local development and testing document still on the schedule?

Yes, of course, I will add it recently.