adding packages

deprecated/flutter_wasm_interop/example/README.md

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+# example
+
+A new Flutter project.
+
+## Getting Started
+
+```dart
+import 'package:flutter/material.dart';
+import 'package:flutter_wasm_interop/flutter_wasm_interop.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      debugShowCheckedModeBanner: false,
+      title: 'Flutter Demo',
+      theme: ThemeData.light(),
+      darkTheme: ThemeData.dark(),
+      home: MyHomePage(title: 'Flutter Demo Home Page'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  MyHomePage({Key key, this.title}) : super(key: key);
+
+  final String title;
+
+  @override
+  _MyHomePageState createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int _counter = 0;
+  WasmLoader _wasm;
+
+  @override
+  void initState() {
+    _wasm = WasmLoader.fromAssets('assets/add.wasm');
+    _wasm.init().then((ready) {
+      if (mounted) setState(() {});
+    });
+    super.initState();
+  }
+
+  void _incrementCounter() {
+    if (_wasm != null) {
+      if (mounted)
+        setState(() {
+          _counter = _wasm.functionParam('add_one', _counter) as int;
+        });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            Text(
+              'You have pushed the button this many times:',
+            ),
+            Text(
+              '$_counter',
+              style: Theme.of(context).textTheme.headline4,
+            ),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _incrementCounter,
+        tooltip: 'Increment',
+        child: Icon(Icons.add),
+      ),
+    );
+  }
+}
+
+```