Add scoring functions for binary classification tasks

[0Zeta]

• Precision (https://en.wikipedia.org/wiki/Precision_and_recall#Definition_(classification_context))
• Recall (https://en.wikipedia.org/wiki/Precision_and_recall#Definition_(classification_context))
• F1 (https://en.wikipedia.org/wiki/F1_score#Formulation)

[dhruvmanila]

Open a PR if you want to submit an algorithm, not create an issue.