Updated .NET Core sample project with keyboard handler.

Samples/Sample.BasicPixelsCore/Window.cs

@@ -1,9 +1,12 @@
 using DotSDL.Graphics;
+using DotSDL.Input.Keyboard;
 using System;
 
 namespace Sample.BasicPixelsCore {
     internal class Window : SdlWindow {
-        public Window(int width, int height) : base("Basic Pixels (.NET Core)", new Point { X = WindowPosUndefined, Y = WindowPosUndefined }, width, height) { }
+        public Window(int width, int height) : base("Basic Pixels (.NET Core)", new Point { X = WindowPosUndefined, Y = WindowPosUndefined }, width, height) {
+            KeyPressed += Window_KeyPressed;
+        }
 
         private void DrawBackground(ref Color[] pixels) {
             byte d = 0;
@@ -111,5 +114,10 @@ namespace Sample.BasicPixelsCore {
 
             return color;
         }
+
+        private void Window_KeyPressed(object sender, DotSDL.Events.KeyboardEvent e) {
+            if(e.Keycode == Keycode.Escape)
+                Stop();
+        }
     }
 }