Add YAML config to map data_filtered.jsonl to test split for Dataset Viewer

Change dataset split from train to test in usage example

Update README

Switch to data_filtered.jsonl (160 examples), remove videoscience_data.csv. Update README for JSONL format.

Fix example count: 160

Remove duplicate data_new.csv, keep videoscience_data.csv only (177 examples). Update README with full example and correct count.

Improve README: add metadata, dataset summary, examples, and usage

initial commit