Create README.md

README.md

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+rmx represent prm that trained on (no required for terminal) node pair under same parent node.
+  rm3 has the best overall test set accuracy
+  rm4.5 and rm6 have higher accuracy on shallow depth and relative good accuracy on overall test set
+rm2-x represent orm that trained on terminal node pair (no required for same parent node).
+  rm2-9.5 has the best overall test set accuracy
+  rm2-2, rm2-9, rm2-2.5 have relative good accuracy on overall test set
+rm3-x represent prm that trained on (no required for terminal) node pair (no required for same parent node).