george/prediction_tracker: Manage and score predictions on arbitrary topics. @ 5f1abb513387c68ab30db9166afd7cb839511f6d

George C. Privon 5f1abb5133 implement entering outcomes		6 lat temu
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brier_score.rkt	88e68619e7 Brier score and unit test	6 lat temu
create_database.rkt	e7afe42672 dummy entry (there should be a better way to initialize things	6 lat temu
update_predictions.rkt	5f1abb5133 implement entering outcomes	6 lat temu