Update README.md

developer0hye · web-flow · commit 11e2e7123598 · 2019-05-13T20:44:54.000+09:00
diff --git a/README.md b/README.md
@@ -10,6 +10,10 @@
 3. Linked List
 4. Rooted Tree
 
+## To do Lists
+1. Double Linkd List
+2. Tree
+
 ## References
 
 ### Theory
