Add single image files for the pictures the QR Scan Difficulty page links to

README.md

@@ -74,6 +74,14 @@ real = load_dataset("devmandan/syn10k-huawei-barcodes", "huawei",   split="train
 syn[0]["image"], syn[0]["mask"]      # PIL images, aligned
 ```
 
+## Single images
+
+`images/warp2014/` holds single JPEG files of the `warp2014` pictures that the QR Scan Difficulty page links to as
+examples, so a reader can open one exact picture and try it with a phone. Each is byte-identical to the image in this
+dataset's Parquet tables and is named by its row in the `warp2014` config, counting from 0 (`00654.jpg` is row 654),
+because the original file names are the codes' contents. The viewer and `load_dataset` read only `data/`, so they are
+unchanged.
+
 ## Citation
 
 Original source: