Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -41,6 +41,7 @@ This means you'll always find an AI-generated solution to compare with or learn
 | December 19, 2025 | [2092](https://leetcode.com/problems/find-all-people-with-secret/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2092) | 🔴 Hard |
 | December 20, 2025 | [944](https://leetcode.com/problems/delete-columns-to-make-sorted/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/944) | 🟢 Easy |
 | December 21, 2025 | [955](https://leetcode.com/problems/delete-columns-to-make-sorted-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/955) | 🟡 Medium |
+| December 22, 2025 | [960](https://leetcode.com/problems/delete-columns-to-make-sorted-iii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/960) | 🔴 Hard |
 
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