add window class

src/ui/window.ts

@@ -0,0 +1,14 @@
+export default class Window {
+  element: HTMLDialogElement = document.createElement("dialog");
+  initial_size = { w: 500, h: 500 } as const;
+
+  constructor() {
+    this.element.style.backgroundColor = "black";
+    this.element.style.width = `${this.initial_size.w}`;
+    this.element.style.height = `${this.initial_size.h}`;
+  }
+
+  start(): HTMLDialogElement {
+    return this.element;
+  }
+}