inital add wool modal design

lib/screens/add_wool_modal.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+import 'package:temperaturdecke/widgets/modal_wrapper.dart';
+
+class AddWoolModal extends StatelessWidget {
+  const AddWoolModal({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ModalWrapper(
+      Column(
+        children: [
+          TextField(),
+          TextField(),
+        ],
+      ),
+      title: "Wolle hinzufügen",
+    );
+  }
+}