Add median of matrix (#4590)

src/main/java/com/thealgorithms/misc/MedianOfMatrix.java

@@ -0,0 +1,30 @@
+package com.thealgorithms.misc;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Median of Matrix (https://medium.com/@vaibhav.yadav8101/median-in-a-row-wise-sorted-matrix-901737f3e116)
+ * Author: Bama Charan Chhandogi (https://github.com/BamaCharanChhandogi)
+ */
+
+public final class MedianOfMatrix {
+
+    public static int median(List<List<Integer>> matrix) {
+        // Flatten the matrix into a 1D list
+        List<Integer> linear = new ArrayList<>();
+        for (List<Integer> row : matrix) {
+            linear.addAll(row);
+        }
+
+        // Sort the 1D list
+        Collections.sort(linear);
+
+        // Calculate the middle index
+        int mid = (0 + linear.size() - 1) / 2;
+
+        // Return the median
+        return linear.get(mid);
+    }
+}