Update README.md

Author: jeffrey-antoine

README.md

@@ -73,6 +73,8 @@
 
 http://ddl.escience.cn/f/IwWE
 
+- ### 入门读物 [The Elements of Statistical Learning(英文第二版),The Elements of Statistical Learning.pdf](http://ddl.escience.cn/ff/emZH)
+
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 利用Python进行数据分析.azw3
 跟老齐学Python：从入门到精通.azw3