Added registration.

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

U2F_Init_CMD.hpp

@@ -0,0 +1,11 @@
+#pragma once
+#include <cstdint>
+#include "U2F_CMD.hpp"
+
+struct U2F_Init_CMD : U2F_CMD
+{
+	uint64_t nonce;
+
+	public:
+		static U2F_Init_CMD get();
+};