added gameboard

gameboard-service/src/lib/actions/resize.ts

@@ -0,0 +1,20 @@
+type Options = {
+  f: (width: number, height: number) => void;
+};
+
+export function resize(node: HTMLElement, options: Options) {
+  const resizeObserver = new ResizeObserver((entries) => {
+    for (const entry of entries) {
+      const w = entry.contentBoxSize[0].inlineSize;
+      const h = entry.contentBoxSize[0].blockSize;
+      options.f(w, h);
+    }
+  });
+  resizeObserver.observe(node);
+
+  return {
+    destroy() {
+      resizeObserver.unobserve(node);
+    }
+  };
+}