Add list of of US states and countries in the ressource folder of the library

[Remi-Gau]

Currently, some of the items in the demographics activity that query about state of birth and residence refer to this gist:
https://gist.githubusercontent.com/mshafrir/2646763/raw/8b0dbb93521f5d6889502305335104218454c2bf/states_hash.json

It might make more sense to have this as one of the resources in the library just like for languages, no?

[Remi-Gau]

Similarly, the country list in the country of birth item actually refers to this json:
https://raw.githubusercontent.com/samayo/country-json/master/src/country-by-name.json