Add public data url table
user
```csv
sitename,url
luquillo,http://luq.lternet.edu/sites/default/files/data/LFDP_Census4-Part1.csv
luquillo,http://luq.lternet.edu/sites/default/files/data/LFDP_Census4-Part1.csv
ferp,http://people.ucsc.edu/~ggilbert/Rclass_docs/FERP07data.csv
```
assistant