could not find a valid GoogleService-Info.plist in your project.

Exception NSException * "FirebaseApp.configure() could not find a valid GoogleService-Info.plist in your project. Please download one from https://console.firebase.google.com/." 0x0000600000c76ee0

자꾸 GoogleService-info.plist가 없다고해서 vscode에서 끌어서 xcode에 놓아도 파일 추가가 안되더라 .

이런식으로 Add Files to 로 추가하면 추가됨.