mobile: Add app icon to home screen

The icon font was created using https://fluttericon.com/.

mobile/lib/icons.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/widgets.dart';
+
+/// Custom icons.
+/// 
+/// This was generated using https://fluttericon.com/.
+class MusicusIcons {
+  MusicusIcons._();
+
+  static const _kFontFam = 'Musicus Icons';
+  static const _kFontPkg = null;
+
+  static const IconData musicus =
+      IconData(0xe800, fontFamily: _kFontFam, fontPackage: _kFontPkg);
+}

mobile/lib/screens/home.dart

@@ -3,6 +3,7 @@ import 'package:musicus_database/musicus_database.dart';
 
 import '../backend.dart';
 import '../editors/tracks.dart';
+import '../icons.dart';
 import '../widgets/lists.dart';
 
 import 'person.dart';
@@ -22,6 +23,10 @@ class _HomeScreenState extends State<HomeScreen> {
 
     return Scaffold(
       appBar: AppBar(
+        leading: Icon(
+          MusicusIcons.musicus,
+          color: Colors.amber,
+        ),
         title: TextField(
           autofocus: true,
           onChanged: (text) {

mobile/pubspec.yaml

@@ -36,3 +36,6 @@ flutter:
       weight: 700
     - asset: fonts/libertinussans_italic.otf
       style: italic
+  - family: Musicus Icons
+    fonts:
+    - asset: fonts/musicus_icons.ttf