Added registration.

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

APDU.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+enum APDU
+{
+	U2F_REG  = 0x01,
+	U2F_AUTH = 0x02,
+	U2F_VER  = 0x03
+};