Create .gitignore

.gitignore

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+# Environment variables and credentials
+.env
+.env.local
+.env.development
+.env.production
+
+# Virtual environments
+venv/
+.venv/
+env/
+env.bak/
+pythonenv/
+
+# Python build artifacts
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+build/
+dist/
+*.egg-info/
+
+# IDE/Editor files
+.idea/
+.vscode/
+*.sublime-workspace
+*.sublime-project
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+# Log files and temporary files
+app.log
+/tmp/
+*.tmp
+*.log
+
+# Generated reports and outputs
+contract_summary_*.csv
+
+# Node.js (if applicable, e.g., for web integration)
+node_modules/
+npm-debug.log
+
+# macOS system files
+*.swp
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Python notebooks (if used)
+*.ipynb_checkpoints
+
+# Test and coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+pytest_cache/
+
+# Docker (if used)
+Dockerfile
+docker-compose.yml
+.dockerignore