Add Avalonia gui

KMeansGui/Shell/ShellView.axaml

@@ -0,0 +1,15 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:kMeansGui="clr-namespace:KMeansGui" x:Name="LayoutRoot"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="KMeansGui.ShellView"
+        Title="KMeansGui">
+	<Window.DataContext>
+		<kMeansGui:ShellViewModel />
+	</Window.DataContext>
+	<Grid RowDefinitions="*,*" ColumnDefinitions="*,*">
+		<Button Command="{Binding OpenCsvFileAsync}" CommandParameter="{Binding ElementName=LayoutRoot}" >Load CSV file</Button>
+	</Grid>
+</Window>