feat: example metadata json

metadata/[email protected]/d41d8cd98f00b204e9800998ecf8427e.json

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+{"latitude": "23.5", "longitude": "44", "author_email": "[email protected]", "date": "2024-10-25", "time": "10:44:41.687799", "predicted_class": null, "class_overriden": null, "image_filename": "000a8f2d5c316a.webp", "image_md5": "d41d8cd98f00b204e9800998ecf8427e"}