MLECO-2079 Adding the C++ KWS example

Signed-off-by: Eanna O Cathain <eanna.ocathain@arm.com>
Change-Id: I81899bbfaada32f478c2e2fc6441eabb94d8d0fc
diff --git a/samples/KeywordSpotting/include/DsCnnMfcc.hpp b/samples/KeywordSpotting/include/DsCnnMfcc.hpp
new file mode 100644
index 0000000..851e010
--- /dev/null
+++ b/samples/KeywordSpotting/include/DsCnnMfcc.hpp
@@ -0,0 +1,20 @@
+//
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include "MFCC.hpp"
+
+/* Class to provide DS-CNN specific MFCC calculation requirements. */
+class DsCnnMFCC : public MFCC 
+{
+
+public:
+
+    explicit DsCnnMFCC(MfccParams& params)
+        :  MFCC(params)
+    {}
+    DsCnnMFCC()  = delete;
+    ~DsCnnMFCC() = default;
+};