chore: add crowdin.yml to translate app metadata description

[yurtpage]

The Fastlane app description also needs to be translatable, especially for F-Droid that doesn't have auto-translation. The Keyboard is intended for a wide range of people, including those who aren't programmers and doesn't know English.
To make the metadata translatable many apps added the Crowdin Configuration YAML File.
After the change translators will see the full_description.txt and short_description.txt in the Crowdin interface.

[rkkr]

As of now Crowding isn't connected to GIT files directly due to mismatches between region codes and special formatting within the strings. I copy-paste them manually. This would probably work for the F-Droid part but not for strings.xml. If app descriptions are being translated then Play Store one would need to be merged.

[yurtpage]

Other apps using the yaml without issues. Maybe that was an old problem that is already fixed?

[rkkr]

They did fix the "special formatting" a while ago. I haven't checked if they handle the android locales properly. Sublocales like values-pt-rPT didn't survive the roundtrip thru crowdin.

[yurtpage]

The other app use same yaml with the %android_code%
https://github.com/orgzly-revived/orgzly-android-revived/blob/master/crowdin.yml

And everything ok with the pt-BR region locale
https://github.com/orgzly-revived/orgzly-android-revived/tree/master/app/src/main/res/values-pt-rBR

[rkkr]

The linked app has all folders in format -locale-sublocale. Here some are just -locale. That mixing will cause issues. -locale-sublocale is probably the %android_code% format in the config.