added devcontainer

Author: ChrisTimperley

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/python
+{
+	"name": "Python 3",
+	"image": "mcr.microsoft.com/devcontainers/python:1-3.12-bullseye",
+	"features": {
+		"ghcr.io/devcontainers-contrib/features/poetry:2": {}
+	},
+	"postCreateCommand": "make install"
+}

README.md

@@ -8,7 +8,10 @@ This repository provides a template for Python 3.12 projects based on [Poetry](h
 * [pytest](https://docs.pytest.org/en/8.2.x) is used for writing tests
 * [ruff](https://docs.astral.sh/ruff) is used for linting and formatting
 
-The file also provides a [GitHub Actions](https://docs.github.com/en/actions) workflow that automatically builds, lints, type checks, and tests the project on every commit, pull request, and direct invocation of the workflow.
+The repository also provides a [GitHub Actions](https://docs.github.com/en/actions) workflow that automatically builds, lints, type checks, and tests the project on every commit, pull request, and direct invocation of the workflow.
+
+Finally, this repository provides a [DevContainer](https://containers.dev) to allow you to get started with development without installing anything to your machine (other than Docker and VSCode).
+To open this project up inside a DevContainer, bring up the command palette in VSCode (CTRL-Shift-P or Command-Shift-P) and select "rebuild and reopen project in DevContainer".
 
 ## Usage