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

README.md

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+
+---
+language: 
+- en
+license: unknown
+license_bigbio_shortname: UNKNOWN
+pretty_name: PCR
+---
+
+
+# Dataset Card for PCR
+
+## Dataset Description
+
+- **Homepage:** http://210.107.182.73/plantchemcorpus.htm
+- **Pubmed:** True
+- **Public:** True
+- **Tasks:** Named Entity Recognition, Event Extraction
+
+
+
+A corpus for plant / herb and chemical entities and for the relationships between them. The corpus contains 2218 plant and chemical entities and 600 plant-chemical relationships which are drawn from 1109 sentences in 245 PubMed abstracts.
+
+
+
+## Citation Information
+
+```
+@article{choi2016corpus,
+  title        = {A corpus for plant-chemical relationships in the biomedical domain},
+  author       = {
+    Choi, Wonjun and Kim, Baeksoo and Cho, Hyejin and Lee, Doheon and Lee,
+    Hyunju
+  },
+  year         = 2016,
+  journal      = {BMC bioinformatics},
+  publisher    = {Springer},
+  volume       = 17,
+  number       = 1,
+  pages        = {1--15}
+}
+
+```