Firebase 추가

Crashlytics 추가
RemoteConfig 이용한 강제 업데이트 로직 추가

.gitignore

@@ -20,7 +20,8 @@ bin/
 gen/
 out/
 #  Uncomment the following line in case you need and you don't have the release build type files in your app
-release/
+/release/
+/debug/
 
 # Gradle files
 .gradle/
@@ -302,7 +303,7 @@ fabric.properties
 ### AndroidStudio Patch ###
 
 !/gradle/wrapper/gradle-wrapper.jar
-app/debug/*
-app/release/*
+app/debug/
+app/release/
 
 # End of https://www.toptal.com/developers/gitignore/api/macos,android,androidstudio,visualstudiocode,git,kotlin,java