add blogs in b-treee (#37)

pingcap · Jun 1, 2021 · 0f509ae · 0f509ae
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diff --git a/README.md b/README.md
@@ -344,6 +344,12 @@ Papers:
 
 ### B-Tree
 
+
+Blogs:
+
+- [B树、B+树索引算法原理（上）](https://www.codedump.info/post/20200609-btree-1/) thanks to [codedump](https://www.codedump.info/)
+- [B树、B+树索引算法原理（下）](https://www.codedump.info/post/20200615-btree-2/) 
+
 Courses:
 
 - CMU [Database Systems (15-445/645)](https://15445.courses.cs.cmu.edu/fall2019/schedule.html), thanks to [Andy Pavlo](http://www.cs.cmu.edu/~pavlo/)