Upload modzs.gctx to figshare

Closes #3: makes modzs.gctx available since original hosting location (C3 Cloud)
is no longer functioning.

Update Zenodo badge from hardcoded to latest.

README.md

@@ -1,6 +1,6 @@
 # Transcriptional signatures of perturbation from LINCS L1000
 
-[![DOI: 10.5281/zenodo.47223](https://zenodo.org/badge/doi/10.5281/zenodo.47223.svg)](https://doi.org/10.5281/zenodo.47223)
+[![DOI](https://zenodo.org/badge/14475/dhimmel/lincs.svg)](https://zenodo.org/badge/latestdoi/14475/dhimmel/lincs)
 
 Python analysis of the [LINCS L1000](http://www.lincscloud.org/) data.
 
@@ -25,6 +25,10 @@ See [this comment](https://doi.org/10.15363/thinklab.d43#7 "Thinklab · Concensu
 
 **Note:** This is not an official LINCS L1000 repository. Users are warned that our modifications may have introduced errors or removed signal that was present the original data.
 
+## Inputs
+
+This repository depends on `modzs.gctx` — a legacy probe × signature matrix of differential expression z-scores. Due to large file size (42.5 GB) this file is not uploaded to GitHub. To recreate this analysis rather than just use the results, users should retrieve [`modzs.gctx` from figshare](https://doi.org/10.6084/m9.figshare.3759129 "modzs.gctx: a legacy LINCS L1000 dataset of differential expression signatures · figshare") and place it in the [`download`](download) directory.
+
 ## License
 
 All original content in this repository is released under [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/ "Creative Commons · Public Domain Dedication"). LINCS data and derivatives are released under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) — please refer to the [LINCS data policy](http://www.lincsproject.org/data/data-release-policy/) and attribute [this repository](https://github.com/dhimmel/lincs) and [LINCS L1000](http://www.lincscloud.org/l1000/).