update readme

README.md

@@ -2,8 +2,33 @@
 
 Gtk/Rust native Spotify client for the Gnome desktop.
 
-WIP! Very early stage of development...
-
-I suck at Rust right now :(
+Based on [librespot](https://github.com/librespot-org/librespot/).
 
 ![Preview](./demo.gif)
+
+## Features
+
+**Only works with premium accounts**
+
+- minimal playback control (play/pause, prev/next, seeking)
+- library browser (saved albums)
+- album search
+- artist view
+- credentials management with Secret Service over DBus
+
+## Building
+
+### With Gnome Builder
+
+Should be as simple as opening the project and hitting run :)
+
+### Manually
+
+Requires Rust (stable), GTK3, and a couple other things. See for instance this [Dockerfile](.github/actions/test/Dockerfile) for dependencies required in Fedora 33. 
+
+Then, with meson:
+
+```
+meson target --prefix="$HOME/.local"
+ninja -C target
+```