Add repos synchronization tool

[Yikun]

We need a tool to do the synchronization from github to gitee, and then use this tool to do the auto-sync periodically.

This patch add a script will fetch all repos from github, and then push them (include commits, branch, tags) to gitee mirror repo.

Close: #2

[Yikun]

The tools demo as above.

[TommyLike]

missing shell header.

[Yikun]

missing shell header.

@TommyLike Good catch, and fixed.

[ZhengZhenyu]

Overall looks good, but got one thing in my head, this seems can be with very low effeciency if we got a lot of repos, probably we could think of some improvement in the future.

[Yikun]

Thanks for the review.

After the consideration of the DRY (Don't Repeat Yourself) principle, this synchronization tool has been replaced by the github action -- Gitee Mirror Action [1].

And now this Gitee Mirror Action v0.01 has been released, so I submited the PR #4 to use it in Kunpeng org. If you have the same requirement on the sync between gitee and github, you could see it as the reference.

Hope you guys have a good exp on trying it.
cc: @TommyLike @leonwanghui @edisonxiang

[1] https://github.com/marketplace/actions/mirror-the-github-organization-repos-to-gitee