docs: add debug for fee

librustzcash-wrapper/src/lib.rs

@@ -2007,6 +2007,12 @@ pub extern "C" fn rust_wrapper_create_transaction(
         }
     }
     if build {
+        let fee_result = if net {
+            main_builder.get_fee(&FeeRule::standard())
+        } else {
+            test_builder.get_fee(&FeeRule::standard())
+        };
+        println!("fee: {:?}", fee_result);
         let (spend_params_in, output_params_in) = load_sapling_parameters();
         //let spend_params_in: Vec<u8> = marshall_from_haskell_var(sapspend, sapspend_len, RW);
         let spend_params_reader = Cursor::new(spend_params_in);