Firebase Remote Config + Application update notice

Implement application update notice with Firebase Remote Config

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Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
app		app
gradle/wrapper		gradle/wrapper
.gitignore		.gitignore
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle