Rewrite frontend using create-react-app

client/CountryUtils.js

@@ -0,0 +1,13 @@
+import {
+  continents as ContinentsIndex,
+  countries as CountriesIndex
+} from 'countries-list'
+
+const getCountriesByContinent = (continent) =>
+  Object.keys(CountriesIndex).filter(country => CountriesIndex[country].continent === continent)
+
+export {
+  ContinentsIndex,
+  CountriesIndex,
+  getCountriesByContinent
+}