adding citation info + description

horse2zebra.py

@@ -6,13 +6,19 @@ import datasets
 from PIL import Image
 
 _CITATION = """\
-
+@inproceedings{CycleGAN2017,
+  title={Unpaired Image-to-Image Translation using Cycle-Consistent Adversarial Networks},
+  author={Zhu, Jun-Yan and Park, Taesung and Isola, Phillip and Efros, Alexei A},
+  booktitle={Computer Vision (ICCV), 2017 IEEE International Conference on},
+  year={2017}
+}
 """
 
 _DESCRIPTION = """\
+Two unpaired sets of photos of respectively horses and zebras, designed for unpaired image-to-image translation, as seen in the paper introducing CycleGAN
 """
 
-_HOMEPAGE = ""
+_HOMEPAGE = "https://people.eecs.berkeley.edu/~taesung_park/CycleGAN/datasets/"
 
 _LICENSE = ""