Move subtree of another tree into LC easy

Author: nwthomas

src/leetcode/easy/easy.md

@@ -25,6 +25,7 @@
 -   [Plus One](plus-one)
 -   [Remove Element](remove-element)
 -   [Reverse Linked List](reverse-linked-list)
+-   [Subtree of Another Tree](subtree-of-another-tree)
 -   [Two Sum](two-sums)
 -   [Valid Anagram](valid-anagram)
 -   [Valid Palindrome](valid-palindrome)

src/leetcode/medium/medium.md

@@ -71,7 +71,6 @@
 -   [Spiral Matrix](spiral-matrix)
 -   [Subsets](subsets)
 -   [Subsets II](subsets-ii)
--   [Subtree of Another Tree](subtree-of-another-tree)
 -   [Target Sum](target-sum)
 -   [Time-Based Key Value Store](time-based-key-value-store)
 -   [Top K Frequent ELements](top-k-frequent-elements)