efficient coding added

Author: zoupeicheng

README.md

@@ -76,5 +76,5 @@ There are many great sources to learn Data Science, and here are some advice to
 
 12. [DeploymentTools](DeploymentTools.md)
 13. Others coming ...
-    * Efficient Coding in Python
+    * [Efficient Coding in Python](EfficientCoding.md)
     * Data Structure and Algorithms