update to add hello world sample

samples/python/agents/azureaifoundry_sdk/hello_world_agent/.env.template

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+# Azure AI Foundry Configuration
+AZURE_AI_FOUNDRY_PROJECT_ENDPOINT=https://your-project.cognitiveservices.azure.com/
+AZURE_AI_AGENT_MODEL_DEPLOYMENT_NAME=your-model-deployment-name
+
+# Optional: Azure Authentication (if not using Azure CLI)
+# AZURE_CLIENT_ID=your-client-id
+# AZURE_CLIENT_SECRET=your-client-secret
+# AZURE_TENANT_ID=your-tenant-id
+
+# Optional: Logging Level
+# AZURE_LOG_LEVEL=INFO

samples/python/agents/azureaifoundry_sdk/hello_world_agent/.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Virtual environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# macOS
+.DS_Store
+
+# Logs
+*.log
+
+# Temporary files
+*.tmp
+*.temp
+
+# Azure credentials (should be in environment or mounted)
+.azure/
+
+# Local development files
+.env.local
+.env.development