fix: correct AgentCard example in README

[CokeLee777]

Description

Replace non-existent .url() and .protocolVersion() builder calls with the correct .supportedInterfaces() method, and add the missing AgentInterface import.

[gemini-code-assist]

Summary of Changes

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This pull request addresses an inaccuracy in the README.md file by updating an outdated AgentCard code example. The changes ensure that the provided example aligns with the current API, guiding users to correctly define agent capabilities and interfaces.

Highlights

• Example Correction: The AgentCard example in README.md has been updated to use the correct supportedInterfaces() method, replacing the non-existent url() and protocolVersion() builder calls.
• Missing Import Added: The necessary AgentInterface import was added to the AgentCard example in README.md to ensure the corrected code snippet is complete and functional.

Changelog

• README.md
  • Corrected the AgentCard example by replacing url() and protocolVersion() builder calls with supportedInterfaces().
  • Added the missing AgentInterface import to the AgentCard example.

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[gemini-code-assist]

Code Review

This pull request corrects a code example for AgentCard in the README.md file. The changes replace calls to non-existent builder methods with the correct .supportedInterfaces() method, and add the required AgentInterface import. The fix is accurate and makes the example code valid. I've added one minor suggestion to improve the formatting of the new code.