Add CDC/ATSDR Social Vulnerability Index

[daltare]

https://www.atsdr.cdc.gov/placeandhealth/svi/index.html

Social vulnerability refers to the potential negative effects on communities caused by external stresses on human health. Such stresses include natural or human-caused disasters, or disease outbreaks. Reducing social vulnerability can decrease both human suffering and economic loss.

The CDC/ATSDR Social Vulnerability Index (CDC/ATSDR SVI) uses 16 U.S. census variables to help local officials identify communities that may need support before, during, or after disasters.

To download data (tract level), go to: https://www.atsdr.cdc.gov/placeandhealth/svi/data_documentation_download.html