docs: add README.md required by repo structure validation

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

Author: kristopherjturner

README.md

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+# Azure Local Cloud Documentation
+
+[![Deploy](https://github.com/AzureLocal/azurelocal.github.io/actions/workflows/deploy.yml/badge.svg)](https://github.com/AzureLocal/azurelocal.github.io/actions/workflows/deploy.yml)
+
+Community documentation for [Azure Local](https://learn.microsoft.com/en-us/azure/azure-local/) — Microsoft's hybrid cloud infrastructure platform enabled by Azure Arc.
+
+**Live site:** [https://azurelocal.cloud](https://azurelocal.cloud)
+
+## What's Here
+
+- **Implementation Guide** — End-to-end deployment runbook covering CI/CD infrastructure, Azure foundation, on-prem readiness, cluster deployment, operational foundations, and testing/validation
+- **Planning** — Naming standards, discovery checklists, site assessment, hardware requirements, landing zone strategy
+- **Design** — High-level and low-level design documents
+- **Operations** — Day-2 operational procedures
+- **Automation** — IaC patterns and pipeline guidance
+- **Azure Services** — Running Azure services on Azure Local (AVD, AKS, SQL MI, App Services, ML/AI)
+- **Lab Environment** — Lab setup and access
+
+## Versioning
+
+Documentation versions align with Azure Local build releases:
+
+| Version | Description |
+|---------|-------------|
+| **2604** | Current — includes Simplified Provisioning (Preview), SAN (Disaggregated) deployment, Local Identity GA |
+| **2411** | Previous release baseline |
+
+## Local Development
+
+```bash
+npm install
+npm run start    # Dev server at http://localhost:3000
+npm run build    # Production build
+```
+
+Built with [Docusaurus](https://docusaurus.io/).
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
+
+## License
+
+See [LICENSE](LICENSE).