Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -268,6 +268,7 @@ _**Note:** Our group is currently taking a break from grinding leetcode. The tab
 | 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 |
 | March 13, 2025 | [3356](https://leetcode.com/problems/zero-array-transformation-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3356) | 🟡 Medium |
 | March 14, 2025 | [2226](https://leetcode.com/problems/maximum-candies-allocated-to-k-children/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2226) | 🟡 Medium |
+| March 15, 2025 | [2560](https://leetcode.com/problems/house-robber-iv/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2560) | 🟡 Medium |
 
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