add structure

lib/face/home.dart

@@ -0,0 +1,40 @@
+import 'face_detection_camera.dart';
+import 'face_detection_image.dart';
+import 'package:flutter/material.dart';
+
+class HomeScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Smile To Face App'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            RaisedButton(
+                child: Text('Add Smile to Face from Image'),
+                onPressed: () {
+                  Navigator.of(context).push(
+                    MaterialPageRoute(
+                      builder: (context) => FaceDetectionFromImage(),
+                    ),
+                  );
+                }),
+            RaisedButton(
+                child: Text('Add Smile to Face from Live Camera'),
+                onPressed: () {
+                  Navigator.of(context).push(
+                    MaterialPageRoute(
+                      builder: (context) => FaceDetectionFromLiveCamera(),
+                    ),
+                  );
+                }),
+          ],
+        ),
+      ),
+    );
+  }
+}
+