add veilid flutter plugin skeleton

veilid-flutter/lib/veilid.dart

@@ -0,0 +1,13 @@
+
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+
+class Veilid {
+  static const MethodChannel _channel = MethodChannel('veilid');
+
+  static Future<String?> get platformVersion async {
+    final String? version = await _channel.invokeMethod('getPlatformVersion');
+    return version;
+  }
+}