Update README.md

README.md

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 license: cc0-1.0
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+
+This dataset is a shuffled list of downloadable CC0 image titles and URLs from [Smithsonian Open Access](https://github.com/Smithsonian/OpenAccess).
+Some images may be omitted due to limitations or oversights in the preprocessing pipeline, but there's no deliberate curation.
+
+This dataset only contains metadata; a tool like https://github.com/rom1504/img2dataset can be used to download the actual images:
+
+```bash
+img2dataset --url_list data --output_folder data_files \
+   --input_format "parquet" --output_format files \
+   --caption_col "text" --url_col "url" \
+   --image_size 256 --min_image_size 128 --resize_mode keep_ratio --resize_only_if_bigger true \
+   --processes_count 16 --thread_count 128
+```
+
+This dataset is dominated by botanical images from NMNH. Here's what a random selection looks like with all NMNH images excluded:
+
+![](random_non_nmnh.png)
+
+vs. a true-random selection:
+
+![](true_random.png)