Add GitHub Codespaces support with devcontainer configuration

[Copilot]

Enables one-click development environment setup via GitHub Codespaces for contributors working across Python, TypeScript, C#, and Java samples.

Changes

• .devcontainer/devcontainer.json: Multi-language devcontainer with Python 3.11, Node.js 20, .NET 9.0, Java 17, and language-specific VS Code extensions. Auto-installs dev dependencies and configures pre-commit hooks on container creation.

• .devcontainer/README.md: Documents included tools, extensions, and usage for both Codespaces and local Dev Containers.

• README.md: Added Codespaces badge and "Getting Started" section presenting Codespaces as the quick-start path alongside local development option.

• CONTRIBUTING.md: Reorganized setup instructions to present Codespaces as Option A, reducing contributor onboarding friction.

Usage

Click the badge or navigate to Code → Codespaces → Create codespace for a fully-configured environment in ~2 minutes.

{
  "name": "Azure AI Foundry Samples",
  "image": "mcr.microsoft.com/devcontainers/universal:2",
  "features": {
    "ghcr.io/devcontainers/features/python:1": {"version": "3.11"},
    "ghcr.io/devcontainers/features/node:1": {"version": "20"},
    "ghcr.io/devcontainers/features/dotnet:2": {"version": "9.0"},
    "ghcr.io/devcontainers/features/java:1": {"version": "17", "installMaven": "true"}
  },
  "postCreateCommand": "pip install -r dev-requirements.txt && pre-commit install"
}

Original prompt

how to use github codespaces here

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