Add documentation for creating and managing Docker containers

[PunkinAnarcrassy]

Add a new section titled "Creating and Managing Docker Containers" to the docs/specs/devcontainer-features.md file.

• Introduce Docker containers and their importance in development environments.
• Provide an overview of Dockerfile, Docker Compose, Dev Container Features, Dev Container Templates, Lifecycle Scripts, Secrets, and Image Metadata.
• Add links to the relevant sections within the document for each concept.
• Ensure the new section is placed appropriately within the document structure.

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For more details, open the Copilot Workspace session.

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[bamurtaugh]

Thanks so much for your contribution, we really appreciate you taking the time!

While this is definitely great info, I think we hopefully have it covered throughout pages like https://containers.dev/overview. Did you feel like the content we already have in the spec and website isn't clear enough or located well enough? Or since this is a contribution to the Features page directly - was there a specific issue with accessing this info from the Features page?

Looking forward to learning more!