fix: add missing useEffect import to App component

[S0nee]

Added import useEffect for the hook to work correctly in the App component.

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PR-Codex overview

This PR updates the README.md file in the packages/web3-react-agw directory to include an additional import statement for useEffect from React, enhancing the functionality of the component.

Detailed summary

• Added useEffect import from React in the README.md file.

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Latest commit: a2e339f

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PR Summary

Updates the AGW README usage example for correctness and behavior.

• Import useEffect in the App example and add an effect to call agw.connectEagerly() on mount with a debug fallback
• Ensures the example compiles and demonstrates eager connection setup

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