Add AGW onramp example

[jarrodwatts]

PR-Codex overview

This PR focuses on integrating the Abstract Global Wallet's FIAT onramp functionality into a Next.js application, allowing users to purchase cryptocurrency using various payment methods.

Detailed summary

• Added Tailwind CSS configuration in postcss.config.mjs.
• Configured next.config.ts to allow specific image domains.
• Created a geo-location API route in route.ts to extract user location.
• Implemented global styles in globals.css using CSS variables.
• Enhanced user interface components for currency and payment selection.
• Added functionality for wallet connection and user authentication.
• Updated README.md with detailed setup instructions and features.

The following files were skipped due to too many changes: agw-onramp/src/utils/currencyUtils.ts, agw-onramp/src/hooks/useGeoLocation.ts, agw-onramp/public/abstract.svg, agw-onramp/src/utils/deviceDetection.ts, agw-onramp/src/components/onramp/SmartAmountInput.tsx, agw-onramp/src/services/onramp.ts, agw-onramp/src/components/onramp/QuickPurchaseFlow.tsx, agw-onramp/pnpm-lock.yaml, agw-onramp/package-lock.json

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