add homepage

lib/module/env/env_page.dart

@@ -0,0 +1,16 @@
+
+import 'package:flutter/material.dart';
+
+class EnvPage extends StatefulWidget {
+  const EnvPage({Key? key}) : super(key: key);
+
+  @override
+  _EnvPageState createState() => _EnvPageState();
+}
+
+class _EnvPageState extends State<EnvPage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold();
+  }
+}