Adding or Updating Examples

• I have followed the "examples guidelines" from the contributing doc: https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md
• I ran pnpm build && pnpm lint to ensure linting passes. See: https://github.com/vercel/next.js/blob/canary/contributing/repository/linting.md

For Maintainers

• This PR introduces a new template called "Next.js Rich Template," designed as a starting point for modern web applications with built-in localization, theme toggling, and other features.
• Slack discussions or relevant conversations are not necessary for this PR.
• No GitHub or Linear issues directly linked, as this PR is an independent addition.

What?

This PR adds the Next.js Rich Template project. It includes the following features:

• Theme Switching: Light and dark modes using next-themes.
• i18n (Internationalization): Multi-language support using next-intl.
• Sitemap: Automatic generation for SEO improvements.
• Responsive Design: Fully responsive with Tailwind CSS.
• Optimized Performance: Built with performance-focused best practices.

Why?

This template simplifies the process of starting new web applications by providing out-of-the-box features for theming, localization, and responsive design. It also improves developer experience by streamlining deployment and providing pre-configured settings.

How?

• Created the template with key features like theming, i18n, and responsive design using Tailwind CSS.
• Added examples and documentation to guide users through installation and usage.
• Set up deployment options with Vercel integration.