Move musicus package to seperate directory

musicus/lib/screens/settings.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+import '../backend.dart';
+
+class SettingsScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final backend = Backend.of(context);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Settings'),
+      ),
+      body: ListView(
+        children: <Widget>[
+          ListTile(
+            leading: Icon(Icons.library_music),
+            title: Text('Music library path'),
+            subtitle: Text(backend.musicLibraryUri),
+            onTap: () {
+              backend.chooseMusicLibraryUri();
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}