Add initial README

Author: gma

README.md

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+devcontainer-features
+=====================
+
+This repository contains [features] for the tools that I find useful when working with [devcontainers].
+
+The implementation of my devcontainer features is based heavily on the examples provided in the [devcontainers/feature-starter] template repository.
+
+[features]: https://containers.dev/features
+[devcontainers]: https://containers.dev
+[devcontainers/feature-starter]: https://github.com/devcontainers/feature-starter