Add initial .NET Aspire solution with AppHost and Web projects

.aspire/settings.json

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+{
+  "appHostPath": "../src/aspire/DevContainers.Aspire.AppHost/DevContainers.Aspire.AppHost.csproj"
+}

.devcontainer/aspire/devcontainer.json

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+{
+  "name": ".NET Aspire",
+  // Base .NET 9 image. Alternatively a Dockerfile/compose could be used.
+  "image": "mcr.microsoft.com/devcontainers/dotnet:9.0-bookworm",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/powershell:1": {}
+  },
+
+  // Install Aspire tooling & workloads early in create lifecycle.
+  // (Previous postCreateCommand replaced by onCreateCommand as requested.)
+  // Former: "postCreateCommand": "dotnet workload install aspire && dotnet restore <project>"
+  "onCreateCommand": "curl -sSL https://aspire.dev/install.sh | bash",
+  // Trust HTTPS dev certs on each container start (may be a no-op in headless Linux but harmless).
+  "postStartCommand": "dotnet dev-certs https --trust || true",
+
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-dotnettools.csdevkit",
+        "GitHub.copilot-chat",
+        "GitHub.copilot"
+      ]
+    }
+  },
+  "forwardPorts": [5087],
+  "portsAttributes": {
+    "5087": { "label": "DevContainers.Aspire.Web", "onAutoForward": "openBrowser" }
+  },
+  "remoteUser": "vscode"
+}

.github/copilot-instructions.md

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+
+# Copilot Project Instructions
+
+This repository contains two main areas:
+
+1. **Marp Slide Deck & Static Site** (for "The Power of Dev Containers and GitHub Codespaces")
+2. **.NET Aspire Sample Solution** (under `src/aspire/`)
+
+---
+
+## 1. Marp Slide Deck & Static Site
+
+- **Source:** `slides/Slides.md` (single source of truth; always edit here)
+- **Assets:** `slides/img/` (images), `slides/themes/` (custom Marp CSS themes)
+- **Dev Containers:** `.devcontainer/slides/devcontainer.json` (authoring), `.devcontainer/codespaces/devcontainer.json` (lightweight demo)
+- **Build/Deploy:** `.github/workflows/marp-pages.yml` (renders Slides.md to `build/index.html` for GitHub Pages)
+
+**Editing/Rendering:**
+- Retain the Marp front-matter block at the top of Slides.md
+- Use Marp directives (theme, footer, bg, columns) for layout
+- Add images to `slides/img/` and reference as `img/name.png`
+- Prefer custom theme files over inline styles
+
+**Multi-deck:**
+- Add new decks as `slides/AnotherTalk.md` and update workflow to render
+
+**Local Preview:**
+```bash
+docker run --rm -v "$PWD:/work" -w /work ghcr.io/marp-team/marp-cli/marp-cli --theme-set slides/themes -o build/index.html --html slides/Slides.md
+```
+
+---
+
+## 2. .NET Aspire Sample Solution (`src/aspire/`)
+
+**Architecture:**
+- `DevContainers.Aspire.AppHost/`: Orchestrator using .NET Aspire hosting model; launches and manages the web project and any future services
+- `DevContainers.Aspire.Web/`: Minimal ASP.NET Core API (expandable)
+- `DevContainers.Aspire.ServiceDefaults/`: Shared service defaults (if present)
+
+**Build/Run Workflow:**
+- Restore all projects: `dotnet restore`
+- Run orchestrator: `dotnet run --project DevContainers.Aspire.AppHost/DevContainers.Aspire.AppHost.csproj`
+- The AppHost will launch the Web project and any additional services
+- Default web endpoint: http://localhost:5087 (see console output for port)
+
+**Dev Container Usage:**
+- Use `.devcontainer/aspire/devcontainer.json` for Aspire development
+- Key tasks:
+  - `onCreateCommand`: Installs Aspire tooling/workloads
+  - `postStartCommand`: Trusts HTTPS dev certs (safe on Linux)
+  - Installs .NET Dev Kit, Copilot, Copilot Chat extensions
+- To start: open `src/aspire/` in VS Code, run "Dev Containers: Reopen in Container", select aspire config
+
+**Docker Strategies:**
+- Docker-in-Docker (DinD): Full isolation, used by default for CI/Codespaces
+- Docker-on-Docker (DoD): Faster, shares host Docker socket; enable by mounting `/var/run/docker.sock` in devcontainer config
+- See `src/aspire/README.md` for tradeoffs and details
+
+**Extending:**
+- Add new services (e.g., databases) via AppHost project
+- Extend the devcontainer image as needed for extra tools
+
+**Patterns/Conventions:**
+- Multiple devcontainer configs under `.devcontainer/` (pattern: `.devcontainer/<name>/devcontainer.json`)
+- All slide content and images are managed in `slides/` (never edit `build/` directly)
+- Aspire solution is intentionally minimal; expand by adding new projects/services under `src/aspire/`
+
+---
+
+## General Guidance
+- Keep changes tightly scoped (content vs. infra)
+- Never commit real secrets; placeholder secrets in devcontainer configs are for demo only
+- No backend/server code outside `src/aspire/` unless intentionally expanding scope
+
+---
+
+## Key References
+- [Dev Containers Docs](https://code.visualstudio.com/docs/devcontainers/create-dev-container)
+- [Aspire Docs](https://learn.microsoft.com/dotnet/aspire/overview/)
+- [Marp CLI](https://marp.app/)
+
+---
+
+Let me know if any section needs elaboration (e.g., multi-deck support, theme authoring, or extending the workflow) and I can refine further.

.vscode/settings.json

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+{
+    "sarif-viewer.connectToGithubCodeScanning": "off"
+}