Add complete Supervised ML Example on NBA and Housing

[noahgift]

• Give example of splitting data: http://scikit-learn.org/stable/modules/generated/sklearn.model_selection.train_test_split.html
• Attempting two to three Algorithms
• Plot Diagnostics
• Show Accuracy score: http://scikit-learn.org/stable/modules/generated/sklearn.metrics.accuracy_score.html