Add README with workshop catalog and project info

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

README.md

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+# GitHub Copilot Dev Days
+
+Landing page for **GitHub Copilot Dev Days** — a collection of hands-on workshops to master GitHub Copilot across every IDE, language, and workflow.
+
+🔗 **Live site:** [copilot-dev-days.github.io](https://copilot-dev-days.github.io)
+
+## Workshops
+
+### VS Code — Agent Lab (Social Bingo)
+
+| Workshop | Stack | Duration |
+|----------|-------|----------|
+| [Agent Lab — Python](https://copilot-dev-days.github.io/agent-lab-python/) | Python + FastAPI + HTMX | ~1 hr |
+| [Agent Lab — TypeScript](https://copilot-dev-days.github.io/agent-lab-typescript/) | TypeScript + Vite + React | ~1 hr |
+| [Agent Lab — Java](https://copilot-dev-days.github.io/agent-lab-java/) | Java 21 + Spring Boot | ~1 hr |
+| [Agent Lab — .NET](https://copilot-dev-days.github.io/agent-lab-dotnet/) | .NET 10 + Blazor | ~1 hr |
+
+### VS Code — Specialized
+
+| Workshop | Stack | Duration |
+|----------|-------|----------|
+| [Mona Mayhem](https://copilot-dev-days.github.io/mona-mayhem/) | VS Code + Astro + TypeScript | ~60 min |
+| [App Modernization](https://copilot-dev-days.github.io/appmod-workshop-java/) | Java + Spring Boot Modernization | ~60 min |
+
+### Terminal
+
+| Workshop | Stack | Duration |
+|----------|-------|----------|
+| [Copilot CLI Workshop](https://copilot-dev-days.github.io/tailspin-toys-workshop/) | Terminal + AI-Powered Development | ~90 min |
+
+### Other IDEs
+
+| Workshop | Stack | Duration |
+|----------|-------|----------|
+| [Copilot for JetBrains](https://copilot-dev-days.github.io/jetbrains-workshop/) | IntelliJ IDEA + Spring PetClinic | ~60 min |
+| [Copilot for Xcode](https://copilot-dev-days.github.io/xcode-workshop/) | Xcode + SwiftUI | ~60 min |
+
+## Prerequisites
+
+- GitHub Account
+- GitHub Copilot License
+- Git installed
+- Your IDE of choice
+
+## Development
+
+This is a static site hosted on GitHub Pages. To run locally, serve the files with any static file server:
+
+```sh
+# Example using Python
+python3 -m http.server
+
+# Example using Node.js
+npx serve
+```
+
+## Links
+
+- [GitHub Organization](https://github.com/copilot-dev-days)
+- [Copilot Docs](https://docs.github.com/en/copilot)
+- [Awesome Copilot](https://github.com/github/awesome-copilot)
+
+---
+
+Built with 💜 by the GitHub Copilot Team