Public holidays API (#212)

examples/holidays/countries/node/listCountries.js

@@ -0,0 +1,12 @@
+import * as holidays from "m3o/holidays";
+
+//
+async function ListCountries() {
+  let holidaysService = new holidays.HolidaysService(
+    process.env.MICRO_API_TOKEN
+  );
+  let rsp = await holidaysService.countries({});
+  console.log(rsp);
+}
+
+await ListCountries();