Added registration.

Currently doesn't return any valid result, hence host believes device
failed to register, however, insecure storage of keys does occur.

U2F_Msg_CMD.hpp

@@ -0,0 +1,27 @@
+#pragma once
+#include "U2F_CMD.hpp"
+#include <cstdint>
+#include <map>
+#include <vector>
+#include <memory>
+
+struct U2F_Msg_CMD : U2F_CMD
+{
+	uint8_t  cla;
+	uint8_t  ins;
+	uint8_t  p1;
+	uint8_t  p2;
+	uint32_t lc;
+	uint32_t le;
+
+	const static std::map<uint8_t, bool> usesData;
+
+	protected:
+		static uint32_t getLe(const uint32_t byteCount, std::vector<uint8_t> bytes);
+
+	public:
+		static std::shared_ptr<U2F_Msg_CMD> get();
+
+		virtual void respond();
+};
+