Better store screenshots

[rozPierog]

Is your feature request related to a problem? Please describe.

Currently Cofi store listing is pretty drab. It would be good to create some more inviting screenshots and hook it up to currently existing screenshot generation scripts.

Describe the solution you'd like

• use ./bin/createScreenshots to create app screenshots on AVD for tablets and phones and copy it to host PC
• use https://github.com/IdeasOnCanvas/ScreenshotFramer CLI to run a script that would compose those screenshots into some frames, and colors
• save it to fastlane folder

Describe alternatives you've considered

• manually editing screenshots - that goes against the spirit of automating release process