add fastlane metadata

app/src/main/play/listings/en-US/full-description.txt

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+Photos.network is an open source project for self hosted photo management.
+
+Its core features are:
+
+    Keep track of your photos with privacy
+    Share photos and albums with friends, family or with public
+    Search for photos by attributes like location or objects

app/src/main/play/listings/en-US/short-description.txt

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+Photos.network is an open source project for self hosted photo management.

app/src/main/play/release-notes/en-US/internal.txt

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+Probably nothing worth noting has been fixed or added with this version.

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

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+A gallery app with focus on privacy and if used with a self-hosted photos.network server extended functionality like photo sharing, backup or image analysis.

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

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+Photos.network is a privacy first, photo gallery which can be extended by a self-hosted photo storage and sharing service.