move ported cpp_shared resources

src/qrcode/cpp_port/mod.rs

@@ -0,0 +1,2 @@
+pub mod decoder;
+// pub mod detector;

src/qrcode/mod.rs

@@ -8,6 +8,8 @@ pub use qr_code_reader::*;
 mod qr_code_writer;
 pub use qr_code_writer::*;
 
+mod cpp_port;
+
 #[cfg(test)]
 #[cfg(feature = "image")]
 mod QRCodeWriterTestCase;