Update DIRECTORY.md

Author: NithinU2802

DIRECTORY.md

@@ -94,6 +94,7 @@
           - 📄 [AnyBaseToAnyBase](src/main/java/com/thealgorithms/conversions/AnyBaseToAnyBase.java)
           - 📄 [AnyBaseToDecimal](src/main/java/com/thealgorithms/conversions/AnyBaseToDecimal.java)
           - 📄 [AnytoAny](src/main/java/com/thealgorithms/conversions/AnytoAny.java)
+          - 📄 [Base64](src/main/java/com/thealgorithms/conversions/Base64.java)
           - 📄 [BinaryToDecimal](src/main/java/com/thealgorithms/conversions/BinaryToDecimal.java)
           - 📄 [BinaryToHexadecimal](src/main/java/com/thealgorithms/conversions/BinaryToHexadecimal.java)
           - 📄 [BinaryToOctal](src/main/java/com/thealgorithms/conversions/BinaryToOctal.java)
@@ -839,6 +840,7 @@
           - 📄 [AffineConverterTest](src/test/java/com/thealgorithms/conversions/AffineConverterTest.java)
           - 📄 [AnyBaseToDecimalTest](src/test/java/com/thealgorithms/conversions/AnyBaseToDecimalTest.java)
           - 📄 [AnytoAnyTest](src/test/java/com/thealgorithms/conversions/AnytoAnyTest.java)
+          - 📄 [Base64Test](src/test/java/com/thealgorithms/conversions/Base64Test.java)
           - 📄 [BinaryToDecimalTest](src/test/java/com/thealgorithms/conversions/BinaryToDecimalTest.java)
           - 📄 [BinaryToHexadecimalTest](src/test/java/com/thealgorithms/conversions/BinaryToHexadecimalTest.java)
           - 📄 [BinaryToOctalTest](src/test/java/com/thealgorithms/conversions/BinaryToOctalTest.java)