Update logo in README-CN.md
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## What does this PR do?
(Provide a description of what this PR does and why it's needed.)
## Test Plan
(Write your test plan here. If you changed any code, please provide us with clear instructions on how you verified your changes work. Screenshots may also be helpful.)
## Related PRs and Issues
- (Related PR or issue)
## Checklist
- [ ] Have you read the [Contributing Guidelines on issues](https://github.com/appwrite/appwrite/blob/master/CONTRIBUTING.md)?
- [ ] If the PR includes a change to an API's metadata (desc, label, params, etc.), does it also include updated API specs and example docs?
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