Create best-of-stackoverflow.md

Author: clarecorthell

best-of-stackoverflow.md

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+## Best of StackOverflow
+
+_I read a lot of StackOverflow. I know the rest of you do. I'm going to get into the weeds and start listing out great answers to specific issues here._
+
+### Machine Learning
+
+- [Similarity between two documents](http://stackoverflow.com/questions/8897593/similarity-between-two-text-documents) (Tf-idf)