Adds an empty shell for what will be my 5380 implementation.

Components/5380/ncr5380.cpp

@@ -0,0 +1,18 @@
+//
+//  ncr5380.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 10/08/2019.
+//  Copyright © 2019 Thomas Harte. All rights reserved.
+//
+
+#include "ncr5380.hpp"
+
+using namespace NCR::NCR5380;
+
+void NCR5380::write(int address, uint8_t value) {
+}
+
+uint8_t NCR5380::read(int address) {
+	return 0;
+}

Components/5380/ncr5380.hpp

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+//
+//  ncr5380.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 10/08/2019.
+//  Copyright © 2019 Thomas Harte. All rights reserved.
+//
+
+#ifndef ncr5380_hpp
+#define ncr5380_hpp
+
+#include <cstdint>
+
+namespace NCR {
+namespace NCR5380 {
+
+/*!
+	Models the NCR 5380, a SCSI interface chip.
+*/
+class NCR5380 {
+	public:
+		/*! Writes @c value to @c address.  */
+		void write(int address, uint8_t value);
+
+		/*! Reads from @c address. */
+		uint8_t read(int address);
+};
+
+}
+}
+
+#endif /* ncr5380_hpp */