feature: VS-Code devcontainer for consistent Rust development

[Mathious6]

I’d like to add a lightweight devcontainer so contributors get the same Rust toolchain, VS Code extensions, settings, and debugger out of the box. This improves on-boarding, reduces "works on my machine" issues, and makes remote development straightforward.

Proposal (minimal, ready-to-tweak):

{
  "name": "Rust [minimal]",
  "image": "mcr.microsoft.com/devcontainers/rust:latest",
  "remoteUser": "vscode",
  "customizations": {
    "vscode": {
      "settings": {
        "editor.formatOnSave": true,
        "terminal.integrated.defaultProfile.linux": "zsh"
      },
      "extensions": [
        "rust-lang.rust-analyzer",
        "vadimcn.vscode-lldb"
      ]
    }
  },
  "features": {
    "ghcr.io/devcontainers-extra/features/zsh-plugins:0": {
      "plugins": "git golang zsh-autosuggestions zsh-syntax-highlighting",
      "omzPlugins": "https://github.com/zsh-users/zsh-autosuggestions https://github.com/zsh-users/zsh-syntax-highlighting",
      "username": "vscode"
    }
  }
}

• I can pin the Rust version via rust-toolchain.toml if you prefer (e.g., stable or a specific version).
• I’ll add a short "Getting started with devcontainers" section to the README.
• If .gitignore currently excludes .devcontainer/, I’ll remove that entry so the config is versioned.

If approved, I’ll open a PR with:

• .devcontainer/devcontainer.json (as above, or with your tweaks)
• optional rust-toolchain.toml
• README update (quick start)

Happy to implement, just let me know your preference on pinning Rust and any additional extensions/settings you want 💪

[azerpas]

close with #48