Adding content to KnownSymmetricCipherAlgorithmql.

java/ql/src/experimental/Quantum/InventorySlices/KnownSymmetricCipherAlgorithm.ql

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+/**
+ * @name Detects known symmetric cipher algorithms
+ * @id java/crypto_inventory_slices/known_symmetric_cipher_algorithm
+ * @kind problem
+ */
+
+import java
+import experimental.Quantum.Language
+
+from Crypto::KeyOperationAlgorithmNode a
+where a.getAlgorithmType() instanceof Crypto::KeyOpAlg::SymmetricCipherAlgorithm
+select a, "Instance of symmetric cipher algorithm " + a.getAlgorithmName()