Add comprehensive guide for migrating from .env files to Doppler:
- Step-by-step instructions for account setup
- List of all required secrets
- CLI installation for macOS/Linux
- PM2 configuration options
- Troubleshooting section
- Team access and CI/CD integration
Note: Manual setup required, not automated.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
