add default theme

kernel/themes/default/assets/DefaultThemesAssets.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace kernel\themes\default\assets;
+
+use kernel\Assets;
+
+class DefaultThemesAssets extends Assets
+{
+    protected function createCSS(): void
+    {
+        $this->registerCSS(slug: "main", resource: "some");
+    }
+
+    protected function createJS(): void
+    {
+        $this->registerJS(slug: "webpack", resource: "some");
+    }
+}