Add pytest config and sample training data

Author: haasonsaas

data/train.jsonl

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+{"instruction": "What is the capital of France?", "output": "The capital of France is Paris."}
+{"instruction": "Explain photosynthesis in simple terms.", "output": "Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into energy and oxygen."}
+{"instruction": "Write a haiku about coding.", "output": "Lines of code unfold,\nLogic dances through the night,\nBugs fixed, dawn arrives."}

pytest.ini

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+[pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+asyncio_mode = auto