Update readme.md

Co-Authored-By: Antim-IWP <203163676+Antim-IWP@users.noreply.github.com>
Co-Authored-By: Shiwangi Srivastava <174641070+IamShiwangi@users.noreply.github.com>

Author: 3 people

Solution/1372. Longest ZigZag Path in a Binary Tree/readme.md

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-Sure! Here's the full `README.md` in the LeetCode-style format, exactly like in the `doocs/leetcode` GitHub repo, for **1372. Longest ZigZag Path in a Binary Tree**:
 
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-```markdown
 # [1372. Longest ZigZag Path in a Binary Tree](https://leetcode.com/problems/longest-zigzag-path-in-a-binary-tree)
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+---
 ## Description
 
 You are given the `root` of a binary tree.
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 }
 ```
 
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-Let me know if you want this in other languages or with a visual diagram too!