Added registration.

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

U2F_CMD.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+struct U2F_CMD
+{
+	protected:
+		U2F_CMD() = default;
+
+	public:
+		~U2F_CMD() = default;
+}; //For polymorphic type casting