### What this PR does / why we need it?
This PR adds Chinese documents for vllm-ascend for Chinese-speaking
developers
### Does this PR introduce _any_ user-facing change?
Change as follows
- add README.zh.md
- add environment.zh.md
- add CONTRIBUTING.zh.md
### How was this patch tested?
By CI
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Signed-off-by: wangli <wangli858794774@gmail.com>
