Update template, add features and image metadata info (#28)

README.md

@@ -2,7 +2,7 @@
 
 [![Open in Dev Containers](https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/microsoft/vscode-remote-try-rust)
 
-A **development container** is a running [Docker](https://www.docker.com) container with a well-defined tool/runtime stack and its prerequisites. You can try out development containers with **[GitHub Codespaces](https://github.com/features/codespaces)** or **[Visual Studio Code Dev Containers](https://aka.ms/vscode-remote/containers)**.
+A **development container** is a running container with a well-defined tool/runtime stack and its prerequisites. You can try out development containers with **[GitHub Codespaces](https://github.com/features/codespaces)** or **[Visual Studio Code Dev Containers](https://aka.ms/vscode-remote/containers)**.
 
 This is a sample project that lets you try out either option in a few easy steps. We have a variety of other [vscode-remote-try-*](https://github.com/search?q=org%3Amicrosoft+vscode-remote-try-&type=Repositories) sample projects, too.
 
@@ -41,20 +41,29 @@ Follow these steps to open this sample in a container using the VS Code Dev Cont
 
 Once you have this sample opened, you'll be able to work with it like you would locally.
 
-> **Note:** This container runs as a non-root user with sudo access by default. Comment out `"remoteUser": "vscode"` in `.devcontainer/devcontainer.json` if you'd prefer to run as root.
-
 Some things to try:
 
 1. **Edit:**
    - Open `main.rs`
    - Try adding some code and check out the language features.
-   - Notice that several extensions are already installed in the container, such as Rust support for VS Code, since the `.devcontainer/devcontainer.json` lists a set of extensions, including `"rust-lang.rust"`, to install automatically when the container is created.
+   - Make a spelling mistake and notice it is detected. The [Code Spell Checker](https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker) extension was automatically installed because it is referenced in `.devcontainer/devcontainer.json`.
+   - Also notice that utilities like `rls` and the [Rust Analyzer](https://marketplace.visualstudio.com/items?itemName=rust-lang.rust-analyzer) extension are installed. Tools are installed in the `mcr.microsoft.com/devcontainers/rust` image and Dev Container settings and metadata are automatically picked up from [image labels](https://containers.dev/implementors/reference/#labels).
+
 1. **Terminal:** Press <kbd>ctrl</kbd>+<kbd>shift</kbd>+<kbd>\`</kbd> and type `uname` and other Linux commands from the terminal window.
+
 1. **Build, Run, and Debug:**
    - Open `main.rs`
    - Add a breakpoint (e.g. on line 8).
    - Press <kbd>F5</kbd> to launch the app in the container.
    - Once the breakpoint is hit, try hovering over variables, examining locals, and more.
+
+1. **Install the GitHub CLI using a Dev Container Feature:**
+   - Press <kbd>F1</kbd> and select the **Dev Containers: Configure Container Features...** or **Codespaces: Configure Container Features...** command.
+   - Type "github" in the text box at the top.
+   - Check the check box next to "GitHub CLI" (published by devcontainers) 
+   - Click OK
+   - Press <kbd>F1</kbd> and select the **Dev Containers: Rebuild Container** or **Codespaces: Rebuild Container** command so the modifications are picked up.
+
  
 ## Contributing