Online Apollo GraphQL Explorer

<!---- Online Apollo GraphQL Explorers to experiment with -------------->

Countries API:  https://studio.apollographql.com/public/countries/explorer?variant=current
Star Wars API:  https://studio.apollographql.com/public/star-wars-swapi/explorer?variant=current
Rick and Morty: https://studio.apollographql.com/public/rick-and-morty-a3b90u/explorer?variant=current

<!-------------- Online Apollo GraphQL Explorers to experiment with ---->
KostasX