Update README with LeetCode Daily Challenge

README.md

@@ -80,6 +80,7 @@ Each day (ideally) we'll attempt the daily [leetcode](https://leetcode.com) prob
 | September 7, 2024 | [1367](https://leetcode.com/problems/linked-list-in-binary-tree/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/1367) | 🟡 Medium |
 | September 8, 2024 | [725](https://leetcode.com/problems/split-linked-list-in-parts/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/725) | 🟡 Medium |
 | September 9, 2024 | [2326](https://leetcode.com/problems/spiral-matrix-iv/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2326) | 🟡 Medium |
+| September 10, 2024 | [2807](https://leetcode.com/problems/insert-greatest-common-divisors-in-linked-list/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2807) | 🟡 Medium |
 
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