Fix minor and major issues

Sources/Linaris/MainPage.xaml.cs

@@ -9,7 +9,7 @@ public partial class MainPage : ContentPage
 
     }
 
-		async public void Go_Home()
+		async public Task Go_Home()
 		{
 			await Navigation.PushAsync(new MainPage());
 

Sources/Model/Stub/Stub.cs

@@ -3,20 +3,40 @@
 public class Stub : IDataManager
 {
 
-    public IEnumerable<Artiste> Artistes;
+    public IEnumerable<Artiste> Artistes
+    {
+        get => artistes;
+    }
+
+    public IEnumerable<Album> Albums
+    {
+        get => albums;
+    }
+
+    public IEnumerable<Playlist> Playlists
+    {
+        get => playlists;
+    }
+
+    public IEnumerable<Title> Titles
+    {
+        get => titles;
+    }
+
+    private IEnumerable<Artiste> artistes;
 
-    public IEnumerable<Album> Albums;
+    private IEnumerable<Album> albums;
 
-    public IEnumerable<Playlist> Playlists;
+    private IEnumerable<Playlist> playlists;
 
-    public IEnumerable<Title> Titles;
+    private IEnumerable<Title> titles;
 
     public Stub()
     {
-        Artistes = new List<Artiste>();
-        Albums = new List<Album>();
-        Playlists = new List<Playlist>();
-        Titles = new List<Title>();
+        artistes = new List<Artiste>();
+        albums = new List<Album>();
+        playlists = new List<Playlist>();
+        titles = new List<Title>();
 
         Artiste Artiste1 = new Artiste("Critien");
         Artiste Artiste2 = new Artiste("Gouriet");