Refactor flavours (#17)

- Fastlane completed
 - Circleci config completed
 - Flavours build completed

gradle.properties

@@ -12,7 +12,7 @@
 android.enableJetifier=true
 android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
-
+kotlin.code.style=official
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects