Re-add explanation of this subset and proper citation for its use

Separate_segmented_train_test_splits_80_20/README.md

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+# Separate_segmented_train_test_splits_80_20
+
+This subset of the 2018 NEON Ethanol-preserved Ground Beetles dataset was generated as part of a project at [BeetlePalooza 2024](https://doi.org/10.5281/zenodo.15540300). The code to generate this collection of images is available in the [Beetle_Palooza_image_separation notebook](https://github.com/Imageomics/2018-NEON-beetles-processing/blob/main/notebooks/Beetle_Palooza_image_separation.ipynb) provided in the [dataset processing repository](ttps://github.com/Imageomics/2018-NEON-beetles-processing). There were two directories of images generated during this processing [`group_images_masks/`](https://huggingface.co/datasets/imageomics/2018-NEON-beetles/tree/7b3731daca1f91931f8086d6782ab9150ab8ce26/group_images_masks) and [`separate_segmented_beetle_images/`](https://huggingface.co/datasets/imageomics/2018-NEON-beetles/tree/7b3731daca1f91931f8086d6782ab9150ab8ce26/separate_segmented_beetle_images), which have associated metadata files in the [metadata directory of the processing repo](https://github.com/Imageomics/2018-NEON-beetles-processing/tree/main/metadata); they are `group_images_masks_sb.csv` and `group_images_sb.csv`, respectively.
+
+## Citation
+
+If these or the final product (`Separate_segmented_train_test_splits_80_20`) are used, please cite both Revision 7b3731d of this dataset and the processing repository:
+
+Dataset [Revision 7b3731d](https://huggingface.co/datasets/imageomics/2018-NEON-beetles/tree/7b3731daca1f91931f8086d6782ab9150ab8ce26):
+
+```
+@misc{isadora_e._fluck_2025,
+	author       = { Isadora E. Fluck and Benjamin Baiser and Riley Wolcheski and Isha Chinniah and Sydne Record },
+	title        = { 2018 {NEON} Ethanol-preserved Ground Beetles (Revision 7b3731d) },
+	year         = 2025,
+	url          = { https://huggingface.co/datasets/imageomics/2018-NEON-beetles },
+	doi          = { 10.57967/hf/5252 },
+	publisher    = { Hugging Face }
+}
+```
+
+Processing Repository:
+```
+@software{Ramirez_2018_NEON_Ethanol-preserved_2025,
+        author = {Ramirez, Michelle and Nepovinnykh, Ekaterina and Ali, Sarwan and Campolongo, Elizabeth G.},
+        doi = {10.5281/zenodo.16989738},
+        license = {MIT},
+        month = aug,
+        title = {{2018 NEON Ethanol-preserved Ground Beetles Processing}},
+        url = {https://github.com/Imageomics/2018-NEON-beetles-processing},
+        version = {2.0.0},
+        year = {2025}
+}
+```
+
+## About this Data Subset
+
+This folder contains cropped images of approximately 7,000 individual images for beetles from the following species (not really 12 species: repeated species epithet in _Pterostichus melanarius melanarius_ indicates this is the nominotypical subspecies of _Pterostichus melanarius_).
+1. _Calathus advena_
+2. _Cyclotrachelus torvus_
+3. _Chlaenius aestivus_
+4. _Euryderus grossus_
+5. _Harpalus pensylvanicus_ OR _Pterostichus pensylvanicus_ --- this species epithet seems to have two different genera associated to it and will thus require more effort for alignment. Hopefully, it's just a matter of merging on an ID from the original dataset but look at the filename generation to figure it out.
+6. _Pterostichus melanarius_
+7. _Pterostichus restrictus_
+8.  _Pterostichus melanarius melanarius_  —  nominotypical subspecies of _Pterostichus melanarius_
+9.  _Pterostichus lachrymosus_
+10.  _Carabus goryi_
+11.  _Cratacanthus dubius_
+12.  _Synuchus impunctatus_
+
+Please see the [processing notebook](https://github.com/Imageomics/2018-NEON-beetles-processing/blob/main/notebooks/Beetle_Palooza_image_separation.ipynb) for more information on how these images were generated, and see the [metadata generation notebook](https://github.com/Imageomics/2018-NEON-beetles-processing/blob/main/notebooks/Separate_segmented_splits_meta_gen.ipynb) for more information on the distribution of species.