Update README.md and add Copilot instructions for EntKube

Co-authored-by: Copilot <copilot@github.com>

README.md

@@ -1,2 +1,48 @@
-# Entkube
+# EntKube
+
+A multi-tenant platform for managing shared Kubernetes applications and infrastructure services.
+
+## Vision
+
+EntKube provides a unified developer portal for provisioning, configuring, and monitoring shared services running on Kubernetes — such as MinIO, CloudNativePG, Keycloak, and more. Teams get self-service access to the infrastructure they need without managing the underlying clusters directly.
+
+## Key Features
+
+- **Shared Application Management** — Deploy, configure, and lifecycle-manage shared services (MinIO, CNPG, Keycloak, etc.) across clusters.
+- **Multi-Tenant SaaS** — Isolated tenants with role-based access, resource quotas, and per-team service instances.
+- **Kubernetes Cluster Management** — Register, monitor, and operate multiple clusters from a single control plane.
+- **Infrastructure Monitoring & Observability** — Health dashboards, alerts, and resource usage metrics for managed services.
+- **Developer Portal** — Self-service UI for teams to request and manage their service instances.
+- **CI/CD Pipeline Integration** — Trigger deployments, view pipeline status, and promote releases across environments.
+
+## Tech Stack
+
+| Layer | Technology |
+|-------|-----------|
+| Frontend | Blazor (.NET 10) — Server + WebAssembly |
+| Backend | ASP.NET Core 10 |
+| Auth | ASP.NET Core Identity with passkey support |
+| Database | SQLite (dev) / PostgreSQL (prod) |
+| ORM | Entity Framework Core 10 |
+
+## Getting Started
+
+```bash
+cd EntKube/EntKube
+dotnet run
+```
+
+The app launches at `https://localhost:7001` (see `Properties/launchSettings.json`).
+
+## Project Structure
+
+```
+EntKube/
+├── EntKube/          # Server-side Blazor host, Identity, data layer
+└── EntKube.Client/   # WebAssembly client project
+```
+
+## License
+
+See [LICENSE](LICENSE).