upload hub_repos/pdr/README.md to hub from bigbio repo

README.md

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+
+---
+language: 
+- en
+license: unknown
+license_bigbio_shortname: UNKNOWN
+pretty_name: PDR
+---
+
+
+# Dataset Card for PDR
+
+## Dataset Description
+
+- **Homepage:** http://gcancer.org/pdr/
+- **Pubmed:** True
+- **Public:** True
+- **Tasks:** Named Entity Recognition, Event Extraction, Coreference Resolution
+
+
+
+The corpus of plant-disease relation consists of plants and diseases and their relation to PubMed abstract.
+The corpus consists of about 2400 plant and disease entities and 300 annotated relations from 179 abstracts.
+
+
+
+## Citation Information
+
+```
+@article{kim2019corpus,
+  title={A corpus of plant--disease relations in the biomedical domain},
+  author={Kim, Baeksoo and Choi, Wonjun and Lee, Hyunju},
+  journal={PLoS One},
+  volume={14},
+  number={8},
+  pages={e0221582},
+  year={2019},
+  publisher={Public Library of Science San Francisco, CA USA}
+}
+
+```