Update build.gradle
Change severity of missing translation to warning
Remove unused icons
Cleanup FolderActivity
Replace ... with ellipsis
fix issues in manifest
Remove unneeded semicolons
Make view type declarations static
Delete autogenerated TODOs
Fix lint warnings when toggling actionbar
remove unused resources
Uncomment strings in french translation
Merge branch 'lint-fixes'
Update README file

Added screenshots, icon, description and Google Play link