docs(README.md): update quick-start readme

[Sodawyx]

Change-Id: I6bcf8d482081dea6fdbe6fad8f6616e99d48d5df
Co-developed-by: Aone Copilot noreply@alibaba-inc.com

Thank you for creating a pull request to contribute to Serverless Devs agentrun-sdk-python code! Before you open the request please answer the following questions to help it be more easily integrated. Please check the boxes "[ ]" with "[x]" when done too.
Please select one of the PR types below to complete

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Fix bugs

Bug detail

The specific manifestation of the bug or the associated issue.

Pull request tasks

• Add test cases for the changes
• Passed the CI test

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Update docs

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Pull request tasks

• Update Chinese documentation
• Update English documentation

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Add contributor

Contributed content

• Code
• Document

Content detail

if content_type == 'code' || content_type == 'document':
    please tell us `PR url`，like: https://github.com/Serverless-Devs/agentrun-sdk-python/pull/1
else:
    please describe your contribution in detail

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Others

Reason for update

Why do you need to update your documentation?