Allow tracers to select counties to send announcement to

1. Add countries list view

Backend:
Provide JSON list for counties list view:

I found a public API: TBD API?

Solution 1: @David: Do you think this is easy to use ^ (dynamic)

Solution 2: Download from the county level data (csv to json)

https://www.ers.usda.gov/data-products/county-level-data-sets/download-data/

Solution 3: Otherwise I will scrap from the web https://en.wikipedia.org/wiki/List_of_counties_by_U.S._state_and_territory for

CountyJSON= [ {

State: ‘NY’

Counties: [

‘Manahttan’

‘Queens’...s

]

}]