Added README.

README.md

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+# Otter for Funkwhale
+
+![](https://img.shields.io/github/license/apognu/otter?style=flat-square)
+[![](https://img.shields.io/travis/apognu/otter/master?style=flat-square)](https://travis-ci/apognu/otter)
+[![](https://img.shields.io/badge/Play%20Store-otter-informational?style=flat-square)](https://play.google.com/store/apps/details?id=com.github.apognu.otter)
+[![](https://img.shields.io/badge/APK-otter-informational?style=flat-square)](https://github.com/apognu/otter/releases)
+
+Otter is a native Android music player for [Funkwhale](https://funkwhale.audio), native to Android (developed in Kotlin) and to Funkwhale (uses its native API instead of Subsonic).
+
+![Otter graphic](https://github.com/apognu/otter/raw/master/app/src/main/play/listings/en-US/graphics/feature-graphic/1.png)
+
+## State
+
+A beta version of the app can be downloaded on [Google Play](https://play.google.com/store/apps/details?id=com.github.apognu.otter) or through [GitHub releases](https://github.com/apognu/otter/releases). Please bear with it, there **will** be bugs, there **will** be crashes and there **will** be performance or UX issues.
+
+Otter's features, as of this writing, are the following:
+
+ * Basic collection browsing (artists, albums and tracks)
+ * Playlists listing
+ * Favorites management (listing and add/remove)
+ * Track search
+ * Queue management
+ * Caching of played tracks (played tracks work offline)
+ * Dark mode! 🎉
+
+Otter will try to behave as you would expect a mobile music player to, meaning integrating with the OS's media controls (including headset controls) or pause on incoming calls. If there is anything you would like it to do, please [open an issue](https://github.com/apognu/otter/issues/new).
+
+## Roadmap
+
+Here is a (non-binding, unfinished) list of what we would like Otter to be able to do - _eventually_:
+
+ * F-Droid listing
+ * Playlist management (including creation and adding/removing of tracks)
+ * Chromecast support
+ * Download ("pin in cache") tracks