chore(docs): What are development containers

README.md

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-# devcontainers
+# ⌨️ Development Containers goodies
+
+> A development container (or dev container for short) allows you to use a container as a full-featured development environment. It can be used to run an application, to separate tools, libraries, or runtimes needed for working with a codebase, and to aid in continuous integration and testing. Dev containers can be run locally or remotely, in a private or public cloud, in a variety of supporting tools and editors. - https://containers.dev