Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -465,6 +465,7 @@ _**Note:** Our group is currently taking a break from grinding leetcode. The tab
 | September 25, 2025 | [120](https://leetcode.com/problems/triangle/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/120) | 🟡 Medium |
 | September 26, 2025 | [611](https://leetcode.com/problems/valid-triangle-number/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/611) | 🟡 Medium |
 | September 27, 2025 | [812](https://leetcode.com/problems/largest-triangle-area/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/812) | 🟢 Easy |
+| September 28, 2025 | [976](https://leetcode.com/problems/largest-perimeter-triangle/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/976) | 🟢 Easy |
 
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