add citation and field descriptions

README.md

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-license: cc-by-4.0
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+---
+license: cc-by-4.0
+---
+## Citation
+DepMap, Broad; Corsello, Steven; Kocak, Mustafa; Golub, Todd (2019). PRISM Repurposing 19Q4 Dataset. figshare. Dataset.
+
+Current dataset: [https://doi.org/10.6084/m9.figshare.9393293.v4](https://doi.org/10.6084/m9.figshare.9393293.v4)
+
+General guidance: [https://doi.org/10.1101/730119](https://doi.org/10.1101/730119)
+
+## Dataset Fields
+- **broad_id**: ID used to identify drug-batch combinations
+- **name**: Name of the drug
+- **depmap_id**: ID to identify a cell line
+- **ccle_name**: ID to identify a cell line
+- **screen_id**: ID to identify a screen
+- **upper_limit**: Limit of the curve as dose approaches infinity
+- **lower_limit**: Limit of the curve as dose approaches zero
+- **slope**: Slope of the dose-response curve
+- **convergence**: Indicates if the dose-response curve fitting procedure converged
+- **r2**: Goodness of fit measure between dose-response curve and replicate viability data
+- **auc**: Area under the dose-response curve
+- **ec50**: Dose at the inflection point of the dose-response curve
+- **ic50**: Dose that corresponds to a viability of 50 on the dose-response curve
+- **moa**: Broad Repurposing Hub mechanism of action annotation
+- **target**: Broad Repurposing Hub gene target annotation
+- **disease_area**: Broad Repurposing Hub disease area annotation
+- **indication**: Broad Repurposing Hub indication annotation
+- **smiles**: Simplified Molecular Input Line Entry System (SMILES) molecular identifier
+- **phase**: Broad Repurposing Hub latest clinical phase annotation
+- **passed_str_profiling**: Indicator for problems identified by STR profiling