feat: initialize Python project structure

- Create pyproject.toml with project metadata
- Add dependencies: mcp, httpx, python-dotenv
- Set up src/gitea_mcp package structure with __init__.py files
- Create placeholder server.py for MCP server implementation
- Add tools subdirectory for future tool implementations
- Create tests directory structure
- Update .gitignore with comprehensive Python exclusions
- Add README.md with project overview

Uses modern src-layout with pyproject.toml (no setup.py).
Project is ready for MCP server implementation.

Closes #1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,43 @@
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+.venv/
+venv/
+ENV/
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db