update readme

Author: hogan-tech

.github/Question List.txt

@@ -10,4 +10,5 @@
 0300-longest-increasing-subsequence python medium
 0446-arithmetic-slices-ii-subsequence python hard
 0938-range-sum-of-bst python easy
-1428-leftmost-column-with-at-least-a-one python medium
+1428-leftmost-column-with-at-least-a-one python medium
+0872-leaf-similar-trees python easy