Checklist for adding new apps:

download icon (ic_launcher)
add new class in de.marmaro.krt.ffupdater.app.impl
add entry in de.marmaro.krt.ffupdater.app.App
add entry in the arrays backgroundupdate_checkexcluded_appsentries + backgroundupdate_checkexcluded_appsentries_values in src/main/res/values/arrays.xml
add entry in AndroidManifest.xml
update README.md
update fastlane/metadata/android/en-US/{full_description.txt,short_description.txt}
- update description in repomaker
update/add unit tests
resolved all TODOs?
add it to CHANGELOG.md?

Extract certificate hash with: keytool -printcert -jarfile *.apk