[Request] we should add a readme for package

[Carrotzpc]

🥰 需求描述 | Feature Description

now：

https://www.npmjs.com/package/@yuntijs/arcadia-bff-sdk

expect：
https://github.com/kubebb/component-store/tree/main/packages/bff-client

🧐 解决方案 | Proposed Solution

we should add a readme for package, like this: https://github.com/kubebb/component-store/tree/main/packages/bff-client

📝 补充信息 | Additional Information

No response

[yunti-bot]

👀 @Carrotzpc
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