Add fastlane Gemfile (DEV) #2028

* Setup fastlane

* Correct todo statment

* Delete fastlane files

* Add Gemfile lock

* Change bundler version to v2.

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>