Add Avalonia gui

KMeansGui/Shell/ShellView.axaml

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+<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>

KMeansGui/Shell/ShellView.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace KMeansGui
+{
+    public partial class ShellView : Window
+    {
+        public ShellView()
+        {
+            InitializeComponent();
+#if DEBUG
+            this.AttachDevTools();
+#endif
+        }
+
+        private void InitializeComponent()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}

KMeansGui/Shell/ShellViewModel.cs

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+using System.Threading.Tasks;
+using Avalonia.Controls;
+using MvvmGen;
+
+namespace KMeansGui
+{
+    [ViewModel]
+    public partial class ShellViewModel
+    {
+
+
+        public async Task OpenCsvFileAsync(object parent)
+        {
+            if (parent is Window window)
+            {
+                var fileDialog = new OpenFileDialog();
+                var result = await fileDialog.ShowAsync(window);
+            }
+        }
+    }
+}