Update README.md, add Grok support

[tummyyu]

XAI_URL and XAI_API_KEY exist but didn't show on readme doc. Just show it now.

💻 变更类型 | Change Type

• feat
• fix
• refactor
• perf
• style
• test
• docs
• ci
• chore
• build

🔀 变更说明 | Description of Change

Update read me doc to add Grok (xAI) variable support

📝 补充信息 | Additional Information

Document change only, code level supported already.

Summary by CodeRabbit

• Documentation
  • Updated documentation to include two new optional environment variables for enhanced API integration.

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[coderabbitai]

Walkthrough

This pull request updates the README.md file to document two new optional environment variables: XAI_API_KEY and XAI_URL. These additions provide details for integrating with the Grok API by specifying the API key and URL in the environment. There are no modifications to the application’s functional code.

Changes

File	Change Summary
README.md	Added documentation for two new optional environment variables: XAI_API_KEY (for the Grok API key) and XAI_URL (for the Grok API URL).

Poem

Hoppity hop through markdown land,
Two new keys now lend a hand.
Grok API dreams in lines of code,
A rabbit's cheer in every node.
With a skip and a smile, innovation is grand!

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (2)

README.md (2)

298-301: Document XAI_API_KEY for Grok API Integration
The documentation for the new environment variable XAI_API_KEY is consistent with the style of other entries in this section. Consider adding additional context or an example value if the Grok API’s usage requires any specific formatting or details—this can help users configure the variable without ambiguity.

---

302-305: Document XAI_URL for Grok API Integration
The new entry for XAI_URL is clear and follows the established pattern. As with XAI_API_KEY, you might consider including a brief note on the expected format or a sample URL if it would assist users in setting up the Grok API URL correctly.

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📥 Commits

Reviewing files that changed from the base of the PR and between f7cde17 and 2e34f1c.

📒 Files selected for processing (1)

• README.md (1 hunks)