License for Files in Data Folder

[joehand]

• [ ] Make sure we own (or can share) all this data
• [ ] Create readme with sources for the each datasets (if we didn't create it)
• [ ] Add license file for data that we own/created

[brelsford]

@joehand, what does SDI think about us sharing the Epworth data? I am sure we are allowed to share everything else.