Add fastlane

This is read by F-Droid, so it should fix our app not having an icon or
having outdated screenshots there.

Also, this can be used to update the Play Store by doing:
  fastlane supply --version-code <version code> --json-key <path to key>

In a future, it would be nice to update the StaticMessages.sh script so
it converts the app description here to .pot and back so we can have KDE
localization teams translate it and updates are automatically picked up.

fastlane/Appfile

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+json_key_file("/please/pass/the/key/using/--json-key/instead")
+package_name("org.kde.kdeconnect_tp")

fastlane/metadata/android/en-US/changelogs/12500.txt

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+1.25.0:
+* Rewrite some of the internals to improve performance.
+* Add search by name in the notification plugin settings.

fastlane/metadata/android/en-US/full_description.txt

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+KDE Connect provides a set of features to integrate your workflow across devices:
+
+- Shared clipboard: copy and paste between your devices.
+- Share files and URLs to your computer from any app.
+- Get notifications for incoming calls and SMS messages on your PC.
+- Virtual touchpad: Use your phone screen as your computer's touchpad.
+- Notifications sync: Read your Android notifications from the desktop.
+- Multimedia remote control: Use your phone as a remote for Linux media players.
+- WiFi connection: no USB wire or bluetooth needed.
+- End-to-end TLS encryption: your information is safe.
+
+Please note you will need to install KDE Connect on your computer for this app to work, and keep the desktop version up-to-date with the Android version for the latest features to work.
+
+This app is part of an open source project and it exists thanks to all the people who contributed to it. Visit the website to grab the source code.

fastlane/metadata/android/en-US/short_description.txt

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+KDE Connect integrates your smartphone and computer

fastlane/metadata/android/en-US/title.txt

@@ -0,0 +1 @@
+KDE Connect