Add initial sketch of example

Author: Weibye

examples/window/create_window.rs

@@ -0,0 +1,16 @@
+//! Shows how to create and manipulate windows in bevy using WindowCommands
+//! 
+
+use bevy::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .run();
+}
+
+// TODO: Make example
+
+fn window_setup(mut commands: Commands) {
+    commands.window();
+}