Add .gitignore (Python/Flask artifacts)

.gitignore

@@ -0,0 +1,51 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual env
+.venv/
+venv/
+env/
+ENV/
+
+# Flask / WSGI
+instance/
+.webassets-cache
+.flaskenv
+.flask_session/
+
+# Byte-compiled / cache
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+
+# Editors / OS
+.vscode/
+.idea/
+*.swp
+.DS_Store
+Thumbs.db
+
+# Logs / temp
+*.log
+/tmp/