add main menu interface

- MainMenu
 - ChatItem (Widget)
 - ChatFolder (Widget)
 - ChatFolders (Widget)
 - ColorTheme

client/lib/widgets/chatFoloders.dart

@@ -0,0 +1,25 @@
+import 'package:client/widgets/chatFoloder.dart';
+import 'package:flutter/material.dart';
+
+class ChatFoloders extends StatelessWidget{
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+      scrollDirection: Axis.horizontal,
+      child: Row(
+        children: [
+          ChatFolder(name: 'Все чаты', icon: Icon(Icons.chat),),
+          ChatFolder(name: 'Контакты', icon: Icon(Icons.person),),
+          ChatFolder(name: 'Групы', icon: Icon(Icons.group),),
+          ChatFolder(name: 'Папка 1'),
+          ChatFolder(name: 'Папка 2'),
+          ChatFolder(name: 'Папка 3'),
+          ChatFolder(name: 'Папка 4'),
+          ChatFolder(name: 'Папка 5'),
+          ChatFolder(name: 'Папка 6'),
+          ChatFolder(name: 'Папка 7'),
+        ],
+      ),
+    );
+  }
+}