Update DIRECTORY.md (#6426)

Co-authored-by: DenizAltunkapan <[email protected]>

Author: DenizAltunkapan

DIRECTORY.md

@@ -132,6 +132,7 @@
           - 📁 **caches**
             - 📄 [FIFOCache](src/main/java/com/thealgorithms/datastructures/caches/FIFOCache.java)
             - 📄 [LFUCache](src/main/java/com/thealgorithms/datastructures/caches/LFUCache.java)
+            - 📄 [LIFOCache](src/main/java/com/thealgorithms/datastructures/caches/LIFOCache.java)
             - 📄 [LRUCache](src/main/java/com/thealgorithms/datastructures/caches/LRUCache.java)
             - 📄 [MRUCache](src/main/java/com/thealgorithms/datastructures/caches/MRUCache.java)
             - 📄 [RRCache](src/main/java/com/thealgorithms/datastructures/caches/RRCache.java)
@@ -488,6 +489,7 @@
           - 📄 [Volume](src/main/java/com/thealgorithms/maths/Volume.java)
         - 📁 **matrix**
           - 📄 [InverseOfMatrix](src/main/java/com/thealgorithms/matrix/InverseOfMatrix.java)
+          - 📄 [MatrixMultiplication](src/main/java/com/thealgorithms/matrix/MatrixMultiplication.java)
           - 📄 [MatrixRank](src/main/java/com/thealgorithms/matrix/MatrixRank.java)
           - 📄 [MatrixTranspose](src/main/java/com/thealgorithms/matrix/MatrixTranspose.java)
           - 📄 [MedianOfMatrix](src/main/java/com/thealgorithms/matrix/MedianOfMatrix.java)
@@ -869,6 +871,7 @@
           - 📁 **caches**
             - 📄 [FIFOCacheTest](src/test/java/com/thealgorithms/datastructures/caches/FIFOCacheTest.java)
             - 📄 [LFUCacheTest](src/test/java/com/thealgorithms/datastructures/caches/LFUCacheTest.java)
+            - 📄 [LIFOCacheTest](src/test/java/com/thealgorithms/datastructures/caches/LIFOCacheTest.java)
             - 📄 [LRUCacheTest](src/test/java/com/thealgorithms/datastructures/caches/LRUCacheTest.java)
             - 📄 [MRUCacheTest](src/test/java/com/thealgorithms/datastructures/caches/MRUCacheTest.java)
             - 📄 [RRCacheTest](src/test/java/com/thealgorithms/datastructures/caches/RRCacheTest.java)
@@ -1177,6 +1180,7 @@
             - 📄 [PrimeFactorizationTest](src/test/java/com/thealgorithms/maths/prime/PrimeFactorizationTest.java)
         - 📁 **matrix**
           - 📄 [InverseOfMatrixTest](src/test/java/com/thealgorithms/matrix/InverseOfMatrixTest.java)
+          - 📄 [MatrixMultiplicationTest](src/test/java/com/thealgorithms/matrix/MatrixMultiplicationTest.java)
           - 📄 [MatrixRankTest](src/test/java/com/thealgorithms/matrix/MatrixRankTest.java)
           - 📄 [MatrixTransposeTest](src/test/java/com/thealgorithms/matrix/MatrixTransposeTest.java)
           - 📄 [MatrixUtilTest](src/test/java/com/thealgorithms/matrix/MatrixUtilTest.java)