Add devcontainer configuration

[JamieMagee]

Describe the feature

Adding a devcontainer¹ configuration to this repo will allow contributors to get up and running quickly with GitHub codespaces².

Footnotes

1. https://code.visualstudio.com/docs/remote/create-dev-container ↩

2. https://github.com/features/codespaces ↩

[github-actions]

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