Update DIRECTORY.md (#6533)

Co-authored-by: alxkm <[email protected]>
Co-authored-by: Oleksandr Klymenko <[email protected]>

Author: DenizAltunkapan

DIRECTORY.md

@@ -672,6 +672,7 @@
           - 📄 [PancakeSort](src/main/java/com/thealgorithms/sorts/PancakeSort.java)
           - 📄 [PatienceSort](src/main/java/com/thealgorithms/sorts/PatienceSort.java)
           - 📄 [PigeonholeSort](src/main/java/com/thealgorithms/sorts/PigeonholeSort.java)
+          - 📄 [PriorityQueueSort](src/main/java/com/thealgorithms/sorts/PriorityQueueSort.java)
           - 📄 [QuickSort](src/main/java/com/thealgorithms/sorts/QuickSort.java)
           - 📄 [RadixSort](src/main/java/com/thealgorithms/sorts/RadixSort.java)
           - 📄 [SelectionSort](src/main/java/com/thealgorithms/sorts/SelectionSort.java)
@@ -1345,6 +1346,7 @@
           - 📄 [PancakeSortTest](src/test/java/com/thealgorithms/sorts/PancakeSortTest.java)
           - 📄 [PatienceSortTest](src/test/java/com/thealgorithms/sorts/PatienceSortTest.java)
           - 📄 [PigeonholeSortTest](src/test/java/com/thealgorithms/sorts/PigeonholeSortTest.java)
+          - 📄 [PriorityQueueSortTest](src/test/java/com/thealgorithms/sorts/PriorityQueueSortTest.java)
           - 📄 [QuickSortTest](src/test/java/com/thealgorithms/sorts/QuickSortTest.java)
           - 📄 [RadixSortTest](src/test/java/com/thealgorithms/sorts/RadixSortTest.java)
           - 📄 [SelectionSortRecursiveTest](src/test/java/com/thealgorithms/sorts/SelectionSortRecursiveTest.java)