Add comprehensive Chinese documentation for project structure, architecture, and usage

[Copilot]

Created detailed Chinese documentation (中文文档.md) covering the Development Container Features repository for Chinese-speaking developers.

Documentation Contents

• Project Overview: Dev Container Features as reusable installation units for containerized development environments
• Background: Dev Containers, Features specification, and containers.dev ecosystem
• Directory Structure: Annotated breakdown of src/ (28 features), test/, .github/workflows/, and standard feature layout
• Architecture:
  • Feature installation flow and dependency resolution via installsAfter
  • OCI distribution through GHCR with semantic versioning
  • Multi-distro compatibility (Debian/Ubuntu, RHEL/Fedora/Alma/Rocky)
• Design Principles: Idempotency, cross-distribution support, version flexibility, declarative configuration
• Feature Anatomy:
  • devcontainer-feature.json schema (options, containerEnv, customizations, dependencies)
  • install.sh patterns for language runtimes, CLI tools, and containerized tools
• Usage Guide: Basic and advanced examples including multi-feature compositions and real-world scenarios (Go microservices, Python data science, full-stack web)
• Development: Feature modification workflow, test authoring (test.sh, scenarios.json), contribution guidelines
• CI/CD: Automated testing matrix across base images, release workflow to GHCR

Example Usage from Documentation

{
  "features": {
    "ghcr.io/devcontainers/features/go:1": {
      "version": "1.21",
      "golangciLintVersion": "latest"
    },
    "ghcr.io/devcontainers/features/docker-in-docker:2": {
      "moby": true
    }
  }
}

Documentation is 1075 lines covering end-to-end understanding from concepts to contribution workflow.

Original prompt

详细分析该项目的 目录结构、架构、设计、原理、背景知识、如何使用，中文回答我

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