Migrated the project to dotnet core 3.0

src/Sample Project/Tutorials/01 - Declaration/SimpleWindowWithNotifyIcon.xaml

@@ -0,0 +1,20 @@
+<Window
+    x:Class="Samples.Tutorials.SimpleWindowWithNotifyIcon"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:tb="http://www.hardcodet.net/taskbar"
+    Height="300"
+    Width="300">
+    <Grid>
+
+        <!-- in order to declare a NotifyIcon, all you need is the namespace declaration (see above on line 5) and a single line -->
+        <tb:TaskbarIcon x:Name="MyNotifyIcon" IconSource="/Icons/Error.ico" ToolTipText="hello world" />
+
+        <TextBlock Margin="26,26,24,0"
+                   VerticalAlignment="Top"
+                   FontWeight="Bold"
+                   TextWrapping="Wrap"
+                   Text="You should see an icon in the tray." />
+
+    </Grid>
+</Window>