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

pyproject.toml

@@ -0,0 +1,16 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "python-helpers"
+version = "1.0.0"
+description = "Generic Python helpers and command-line tools with no cloud-specific logic"
+requires-python = ">=3.9"
+
+[project.scripts]
+serve-markdown = "python_helpers.cli.serve_markdown:main"
+token-decoder = "python_helpers.cli.token_decoder:main"
+
+[tool.setuptools.packages.find]
+include = ["python_helpers*"]