Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -265,6 +265,7 @@ _**Note:** Our group is currently taking a break from grinding leetcode. The tab
 | March 9, 2025 | [3208](https://leetcode.com/problems/alternating-groups-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3208) | 🟡 Medium |
 | March 10, 2025 | [3306](https://leetcode.com/problems/count-of-substrings-containing-every-vowel-and-k-consonants-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3306) | 🟡 Medium |
 | March 11, 2025 | [1358](https://leetcode.com/problems/number-of-substrings-containing-all-three-characters/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/1358) | 🟡 Medium |
+| March 12, 2025 | [2529](https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2529) | 🟢 Easy |
 
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