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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