roi peker

add docs to get_view.dart

very simple doc reference.
import 'package:flutter/widgets.dart';
import 'package:get/src/instance/get_instance.dart';
/// GetView is a great way of quickly access your Controller
/// without having call Get.find<Controller>() yourself.
abstract class GetView<T> extends StatelessWidget {
const GetView({Key key}) : super(key: key);
T get controller => GetInstance().find<T>();
... ...