chore: import upstream snapshot with attribution

faq/datamining-overview.md

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+# What are the different fields of study in data mining?
+
+
+I would roughly define the different application areas as
+
+1) Clustering (unsupervised learning)
+e.g., to find groups of customers based on some similarity
+
+2) Predictive modeling (supervised learning)
+2.1) Classification
+        e.g., medical diagnosis (sick/healthy), image classification etc.
+2.2) Regression
+      e.g., stock trade change prediction
+2.3) Ranking
+      e.g., search engine results
+
+3) Association rule mining
+e.g., which products do customers frequently buy together
+
+4) Anomaly detection
+e.g., credit fraud detection