RxSwift 참고 URL
곰튀김님 유튜브 RsSwift(4시간) https://www.youtube.com/watch?v=w5Qmie-GbiA&t=2322s
공식 ReactiveX URL https://github.com/ReactiveX/RxSwift
곰튀김님 유튜브 채널 https://www.youtube.com/channel/UCsrPur3UrxuwGmT1Jq6tkQw
RxSwfit와 MVVM https://pilgwon.github.io/blog/2018/10/09/Creating-an-iOS-app-with-MVVM-and-RxSwift-in-Minutes.html