Update DIRECTORY.md

Author: DenizAltunkapan

DIRECTORY.md

@@ -268,6 +268,7 @@
             - 📄 [BinaryTree](src/main/java/com/thealgorithms/datastructures/trees/BinaryTree.java)
             - 📄 [BoundaryTraversal](src/main/java/com/thealgorithms/datastructures/trees/BoundaryTraversal.java)
             - 📄 [CeilInBinarySearchTree](src/main/java/com/thealgorithms/datastructures/trees/CeilInBinarySearchTree.java)
+            - 📄 [CentroidDecomposition](src/main/java/com/thealgorithms/datastructures/trees/CentroidDecomposition.java)
             - 📄 [CheckBinaryTreeIsValidBST](src/main/java/com/thealgorithms/datastructures/trees/CheckBinaryTreeIsValidBST.java)
             - 📄 [CheckIfBinaryTreeBalanced](src/main/java/com/thealgorithms/datastructures/trees/CheckIfBinaryTreeBalanced.java)
             - 📄 [CheckTreeIsSymmetric](src/main/java/com/thealgorithms/datastructures/trees/CheckTreeIsSymmetric.java)
@@ -1069,6 +1070,7 @@
             - 📄 [BinaryTreeTest](src/test/java/com/thealgorithms/datastructures/trees/BinaryTreeTest.java)
             - 📄 [BoundaryTraversalTest](src/test/java/com/thealgorithms/datastructures/trees/BoundaryTraversalTest.java)
             - 📄 [CeilInBinarySearchTreeTest](src/test/java/com/thealgorithms/datastructures/trees/CeilInBinarySearchTreeTest.java)
+            - 📄 [CentroidDecompositionTest](src/test/java/com/thealgorithms/datastructures/trees/CentroidDecompositionTest.java)
             - 📄 [CheckBinaryTreeIsValidBSTTest](src/test/java/com/thealgorithms/datastructures/trees/CheckBinaryTreeIsValidBSTTest.java)
             - 📄 [CheckIfBinaryTreeBalancedTest](src/test/java/com/thealgorithms/datastructures/trees/CheckIfBinaryTreeBalancedTest.java)
             - 📄 [CheckTreeIsSymmetricTest](src/test/java/com/thealgorithms/datastructures/trees/CheckTreeIsSymmetricTest.java)