Update README.md

developer0hye · web-flow · commit 7f7124c6c54b · 2018-12-02T14:11:18.000+09:00
diff --git a/README.md b/README.md
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 ## Why study data structures?
 
+## Basic Data Structures
+1. Stack
+2. Queue
+3. Linked List
+4. Rooted Tree
 
 ## References
 
