docs: update router return statement to include type casting for next 14 app router

[OgDev-01]

Fixes #241

This PR updates the readme to include a life saving section that fixes an error with h Next.js 14 app router in production/preview using typescript

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All modified and coverable lines are covered by tests ✅

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[OgDev-01]

Hello @hoangvvo, Thanks for putting up this wonderful library 💯 . It has been a lifesaver for me since i started writing server code in nextjs.

I made a small update to the readme for a current issue we have with NextJS14 app router. This would prevent new/existing users who use nextjs 14 app router from facing issues with return type errors for the route handlers export.

Would you mind taking a look at this when you have the time?

Thanks 🤝