feat(ui/window): center window (#47)

Signed-off-by: Tony Gorez <[email protected]>

src/ui/window/appkit/window_appkit.mm

@@ -47,6 +47,7 @@ auto show() -> void {
     NSWindowController *controller = [window_ windowController];
     [controller showWindow:nil];
     [window_ makeKeyAndOrderFront:controller];
+    [window_ center];
   }
 
   auto size(const unsigned int width, const unsigned int height) -> void {