Add ML-mini: age-classifier exercise with test and docs

Author: shahpari2kht

ML-mini/age-classifier/README.md

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+# age-classifier
+
+> Mini Python exercise for age group prediction.
+
+This script classifies basic age groups (young/adult/senior) based on wrinkle count.  
+Part of the **ML-mini** submodule inside `python-projects` repository.
+
+## Example
+```python
+from age_classifier import predict_age
+result = predict_age({"wrinkles": 5})
+print(result)  # adult
+
+pytest tests/test_age_classifier.py -v

ML-mini/age-classifier/age_classifier.py

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+def predict_age(features):\n    """Simple demonstration: return age group based on sample feature."""\n    if features.get("wrinkles", 0) > 5:\n        return "senior"\n    elif features.get("wrinkles", 0) > 1:\n        return "adult"\n    else:\n        return "young"\n

ML-mini/age-classifier/tests/test_age_classifier.py

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+from age_classifier import predict_age\n\ndef test_predict_age():\n    assert predict_age({"wrinkles": 0}) == "young"\n    assert predict_age({"wrinkles": 3}) == "adult"\n    assert predict_age({"wrinkles": 8}) == "senior"