Create README.md

Author: clorton

README.md

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+# EMOD-InputData
+Full set of input data files for use with the EMOD disease transmission model
+
+## *Important*
+This repository uses [LFS](https://git-lfs.github.com/) (large file storage) to manage the binaries and large JSON file(s). In order to retrieve the actual data, please follow these steps:
+
+1. `git clone https://github.com/InstituteforDiseaseModeling/EMOD-InputData.git` (standard clone command)
+2. `git lfs fetch` (caches the actual data on your local machine)
+3. `git lfs checkout` (replaces the metadata in the files with the actual contents)