add fresh project

fresh-project/islands/Counter.tsx

@@ -0,0 +1,17 @@
+import { useSignal } from "@preact/signals";
+import { Button } from "../components/ui/button.tsx";
+
+export default function Counter() {
+  const count = useSignal<number>(3);
+  return (
+    <div class="flex gap-8 py-6">
+      <Button variant="outline" id="decrement" onClick={() => count.value -= 1}>
+        -1
+      </Button>
+      <p class="text-3xl tabular-nums">{count.value}</p>
+      <Button variant="outline" id="increment" onClick={() => count.value += 1}>
+        +1
+      </Button>
+    </div>
+  );
+}