Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -42,6 +42,7 @@ This means you'll always find an AI-generated solution to compare with or learn
 | January 20, 2026 | [3314](https://leetcode.com/problems/construct-the-minimum-bitwise-array-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3314) | 🟢 Easy |
 | January 21, 2026 | [3315](https://leetcode.com/problems/construct-the-minimum-bitwise-array-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3315) | 🟡 Medium |
 | January 22, 2026 | [3507](https://leetcode.com/problems/minimum-pair-removal-to-sort-array-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3507) | 🟢 Easy |
+| January 23, 2026 | [3510](https://leetcode.com/problems/minimum-pair-removal-to-sort-array-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3510) | 🔴 Hard |
 
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