docs: add project documentation

TODO.md

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+# TODO
+
+Intake buffer for ideas, issues, and unrefined tasks.
+
+## Ideas
+
+- Support for `.harborrc` config file in home directory
+- Cache project/repo lists for faster tab completion
+- Webhook management commands
+- Robot account management
+- Retention policy display
+- Health check endpoint monitoring
+- Multi-registry support (switch between registries)
+
+## Issues
+
+- SSL verification disabled globally (should be configurable)
+- No timeout configuration for API calls
+- Delete confirmation reads stdin (breaks piping)
+- Partial digest matching fetches all artifacts (slow for large repos)
+
+## Questions
+
+- Should `--json` output be available on all commands?
+- Should we support OIDC authentication?
+- Worth adding `--dry-run` for destructive operations?
+
+## Debt
+
+- Error handling inconsistent across commands
+- Some magic numbers (column widths, timeouts)