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;
+  }
+}

veilid-flutter/lib/veilid_web.dart

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+import 'dart:async';
+// In order to *not* need this ignore, consider extracting the "web" version
+// of your plugin as a separate package, instead of inlining it in the same
+// package as the core of your plugin.
+// ignore: avoid_web_libraries_in_flutter
+import 'dart:html' as html show window;
+
+import 'package:flutter/services.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+/// A web implementation of the Veilid plugin.
+class VeilidWeb {
+  static void registerWith(Registrar registrar) {
+    final MethodChannel channel = MethodChannel(
+      'veilid',
+      const StandardMethodCodec(),
+      registrar,
+    );
+
+    final pluginInstance = VeilidWeb();
+    channel.setMethodCallHandler(pluginInstance.handleMethodCall);
+  }
+
+  /// Handles method calls over the MethodChannel of this plugin.
+  /// Note: Check the "federated" architecture for a new way of doing this:
+  /// https://flutter.dev/go/federated-plugins
+  Future<dynamic> handleMethodCall(MethodCall call) async {
+    switch (call.method) {
+      case 'getPlatformVersion':
+        return getPlatformVersion();
+      default:
+        throw PlatformException(
+          code: 'Unimplemented',
+          details: 'veilid for web doesn\'t implement \'${call.method}\'',
+        );
+    }
+  }
+
+  /// Returns a [String] containing the version of the platform.
+  Future<String> getPlatformVersion() {
+    final version = html.window.navigator.userAgent;
+    return Future.value(version);
+  }
+}