add examples

Author: Sergey Khomushin

README.md

@@ -47,3 +47,19 @@ try {
   print(error.toString());
 }
 ```
+
+**init (optional)**
+```dart 
+import package:emailjs/emailjs.dart
+
+// set Public Key as global settings
+EmailJS.init('<YOUR_PUBLIC_KEY>');
+
+try {
+  // send the email without dynamic variables
+  await EmailJS.send('<YOUR_SERVICE_ID>','<YOUR_TEMPLATE_ID>');
+  print('SUCCESS!');
+} catch (error) {
+  print(error.toString());
+}
+```

examples/lib/main.dart

@@ -0,0 +1,69 @@
+import 'package:flutter/material.dart';
+import 'package:emailjs/emailjs.dart';
+
+void main() {
+  runApp(const App());
+}
+
+class App extends StatelessWidget {
+  const App({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo EmailJS',
+      theme: ThemeData(
+        primarySwatch: Colors.orange,
+      ),
+      home: const HomePage(title: 'Flutter Demo EmailJS'),
+    );
+  }
+}
+
+class HomePage extends StatefulWidget {
+  const HomePage({super.key, required this.title});
+  final String title;
+
+  @override
+  State<HomePage> createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  void _sendEmail() async {
+    try {
+      await EmailJS.send(
+        '<YOUR_SERVICE_ID>',
+        '<YOUR_TEMPLATE_ID>',
+        {
+          'user_email': 'hi@example.com',
+          'message': 'Hi',
+        },
+        '<YOUR_PUBLIC_KEY>',
+      );
+      print('SUCCESS!');
+    } catch (error) {
+      print(error.toString());
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            const Text(
+              'Press "Send Email" to send email',
+            ),
+            ElevatedButton(
+                onPressed: _sendEmail, child: const Text('Send Email')),
+          ],
+        ),
+      ),
+    );
+  }
+}