Add initial implementation of Python helpers and CLI tools

- Create .gitignore to exclude build artifacts
- Add README.md with project description and installation instructions
- Implement pyproject.toml for package metadata and script entry points
- Add console output helpers for command-line scripts
- Implement environment file loading functionality
- Add JSON file I/O helpers
- Create token decoder CLI for decoding JWT claims
- Implement serve-markdown CLI for serving Markdown files as HTML

.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+*.egg-info/
+dist/
+build/