feat: basic song ui + settings

protos/library.proto

@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+import 'google/protobuf/empty.proto';
+
+package library;
+
+service Library {
+	rpc ListTracks(google.protobuf.Empty) returns (TrackList);
+}
+
+message TrackList {
+	repeated Track tracks = 1;
+}
+
+message Track {
+	string hash = 1;
+	string name = 2;
+	string artist_name = 3;
+	uint64 artist_id = 4;
+}