Add a header

Author: Xing Han

doc/python/ml-knn.md

@@ -1,6 +1,43 @@
-## K-Nearest Neighbors (kNN)
-
-How to visualize the K-Nearest Neighbors (kNN) algorithm using scikit-learn.
+---
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+    name: k-Nearest Neighbors
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+    thumbnail: thumbnail/line-and-scatter.jpg
+---
+
+## K-Nearest Neighbors (kNN) Classification
+
+How to visualize K-Nearest Neighbors (kNN) classification using scikit-learn.
 
 
 ### Binary Probability Estimates with `go.Contour`