add minimal fastlane metadata

fastlane/metadata/android/en-US/changelogs/209.txt

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+* Rebrand app to DSub2000 to indicate the fork
+* Change setting defaults to improve compatibility and UI clarity
+* Added a random option to the songs part of the mainview
+* Add option to show a single rating button
+* Make tapping on cover art to open playlist configurable
+* When the user has made a selection, only the selected songs are downloaded
+* Migrate to vector drawables
+* Setting to add song suffix as details of list song item
+* Toggling the caching status from "permanently cached" to just "cached" (and back) does not require connectivity
+* Fix replaygain selection logic for track gain
+* Fix album sort with duplicate track numbers
+* Fix offline scrobbling for servers without lucene support
+* Make connections secure by default CVE-2018-1000664
+* Port from orphaned cling to jupnp
+* Sync bastp to upstream/ vanilla-music for improved replaygain parsing
+* Replace subsonic.org demo server with navidrome.org demo server

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

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+Connect to your Subsonic server and listen to your music wherever you go. Songs
+are cached for playback to save on your mobile bandwidth and to make them
+available when you have no connection at all.
+
+Subsonic is a cross-platform FOSS media server that's capable of indexing very
+large media collections. The server can transcode if necessary so that the app
+can play files that your device may not normally support.
+
+<h2>Features</h2>
+
+<ul>
+<li>Drag and drop songs to rearrange your playlist on the Now Playing tab</li>
+<li>Pause playback when other apps request audio focus (navigation, etc)</li>
+<li>Lockscreen controls</li>
+<li>Gapless Playback</li>
+<li>Highly customizable UI</li>
+<li>User defined Cache Size, Network Timeout, and Buffer Length</li>
+</ul>

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

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+Android client for Subsonic servers.