initial implementation of listening queue

lib/Controller/EpisodeController.php

lib/Db/Episode.php

lib/Migration/Version000100Date20210201162900.php

lib/Service/EpisodeService.php

src/components/Table.vue

src/router.js

src/services/EpisodeApi.js

src/store/episode.js

src/store/player.js

src/views/Listening.vue