initial fastlane structures from IzzyOnDroid

[IzzySoft]

this PR provides you with a "fastlane starter package" – to give it into your hands to define how your app is presented, and make it easy to keep descriptions & graphics in sync with your development. Some notes to sum them up in a place easy to find for you:

• the IzzyOnDroid Fastlane Documentation can guide you with maintaining the structures here
• take special care for limits, e.g. per-release changelogs can have max 500 chars, full_description.txt max 4,000 chars, graphics must have specific aspect ratios etc.
• you can have "bigger graphics" here; the IoD updater takes care to resize/optimize them as needed
• for the full_description.txt here I've used HTML compressed into a single line, to prevent the fdroid software converting each line break to a <br>. The tags used for this are supported by F-Droid.org as well, and to my knowledge even by PlayStore.
• whenever you add a new "type" of metadata that has not been there before (e.g. the first changelog, a featureGraphic if it wasn't yet present), please let us know so we can check and enable it.
• Details on all this in the linked documentation.
• Once merged, your changes will be synced whenever a new release is pulled in here – to make sure it stays up-to-date with the app itself.
• Should you have questions, be welcome to ask 😉

The second commit adds the IzzyOnDroid badge (linking to ScoreCounter there) to the Readme.

And now: Enjoy!

[hegocre]

Thank you for your contribution, this is great!

It would also be great to add the changelog for the new version (1.5.0), so that you can start syncing changelogs already. Would you like me to add it after the merge, or would you like to add it yourself (just adding the same changelog as the GitHub release would be fine)?

Thanks again!

[IzzySoft]

Adding it after the merge is fine. Just give me a ping once it's there, so I can cross-check and enable it here (changelogs are one part often "going wrong", so we prefer checking first. Quick notes/keywords: max len 500 char (saw some witn 2k+ 😱), name must be <versionCode>.txt (often enough we see <versionName> used there instead, which doesn't work), plain text only (no HTML tags etc)).

[IzzySoft]

@hegocre any chance to get this merged? As we need to move on with our repo reorg at IzzyOnDroid, it would help us a lot. Thanks in advance!

[hegocre]

Hi!

I've gone ahead and merged this PR, I'll add the changelog as soon as I can and ping you.

Thank you!

[IzzySoft]

Thanks a lot 🤗 activated on our end now. Changes you make will then be synced whenever a new release is being pulled in. Changelogs will be activated when you let us know they are available.