Add CLAUDE.md documentation for project structure and conventions

[vbargl]

Summary

Add comprehensive developer documentation (CLAUDE.md) that outlines the ZeroTier CLI tool's architecture, build process, project structure, and key conventions.

Changes

• New file: CLAUDE.md with complete project overview including:
  • Build and run instructions
  • Project directory structure and purpose of each module
  • Key naming conventions (command files, platform-specific files, generated code)
  • CLI architecture and command patterns
  • Configuration system details
  • Dependencies and their purposes
  • Go patterns and idioms used throughout the codebase

Details

This documentation serves as a reference guide for developers working on the project, covering:

• How to build, run, and generate code
• Where to find specific functionality (commands, config, API client, etc.)
• Important conventions to follow when adding new features
• Architecture decisions (Cobra CLI framework, auto-generated OpenAPI client, custom error types)
• Current project status (e.g., set command is WIP)

This is a documentation-only change with no impact on functionality.

https://claude.ai/code/session_018DQDABspBNztsxkME5JFfu