All logic encapsulated in:

RandomUserRequester.requestUser("some parameters");

This method returns json string of users in format:

{
 "results": [
   {
     //      user data;
   },
   {
     //      user data;
   }
 ]
}

There are special parameters saved in request-settings.json, that could be passed to requestUser, use List of Parameter objects, where parameter.key is name of setting and parameter.value - value.