docs: add README

README.md

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+# rnrcli.io
+
+[![Build](https://img.shields.io/github/actions/workflow/status/CodingWithCalvin/rnrcli.io/build.yml?style=for-the-badge)](https://github.com/CodingWithCalvin/rnrcli.io/actions)
+[![License](https://img.shields.io/github/license/CodingWithCalvin/rnrcli.io?style=for-the-badge)](LICENSE)
+
+The website for [rnr](https://github.com/CodingWithCalvin/rnr.cli), a cross-platform task runner with zero-setup execution.
+
+## Tech Stack
+
+- [Astro](https://astro.build/) - Static site generator
+- [Tailwind CSS](https://tailwindcss.com/) - Styling
+- [Cloudflare Workers](https://workers.cloudflare.com/) - Hosting
+
+## Development
+
+```bash
+npm install
+npm run dev
+```
+
+## Build
+
+```bash
+npm run build
+```
+
+## Project Structure
+
+```
+src/
+├── components/    # Reusable Astro components
+├── content/docs/  # Documentation markdown files
+├── layouts/       # Page layouts
+├── pages/         # Site pages
+└── styles/        # Global styles
+public/            # Static assets
+```