1.  https://riverpod.dev/docs/introduction/getting_started
    1.1.  commands run in terminal
        >>
        flutter pub add flutter_riverpod
        flutter pub add riverpod_annotation
        flutter pub add dev:riverpod_generator
        flutter pub add dev:build_runner
        flutter pub add dev:custom_lint
        flutter pub add dev:riverpod_lint
        <<
    1.2.
       >>
       flutter pub get
       flutter pub run build_runner build ( instead of flutter pub run build_runner watch)
       <<
    1.3.  Add Links.txt file.
    1.4.  Checkout in other station ==> Must re run 1.1. steps again. (I don't Know why)
        (Re-run can update dependencies)
    1.5. Update analysis_options.yaml, then run
         >>
           dart run custom_lint
         <<
    1.6. Add a "hello world" sample to "main_hello_riverpod.dart", we have some error in code.
         Now run
         >>
         flutter pub run build_runner build
         <<
         to generate some files (include main_hello_riverpod.g.dart).
         Then fix "main_hello_riverpod.dart" with (main.g.dart --> main_hello_riverpod.g.dart).
    1.7.  After a while, i read the document. Now updated some dependencies and starting
          use riverpod again.
          Now I know many things about it, but riverpod learning curve is not good.
          Flutter was better but not good at result. I will stick on learning curve before
          developing the app.

2.  https://riverpod.dev/docs/essentials/first_request
    2.1. Install freezed using this commands:
         (using https://github.com/rrousselGit/freezed?tab=readme-ov-file#install)
        >>
        flutter pub add freezed_annotation
        flutter pub add dev:build_runner
        flutter pub add dev:freezed
        flutter pub add json_annotation
        flutter pub add dev:json_serializable
        <<
        install flutterX & FlutterAssetsGenerator & freezed plugins.
    2.2. Add model for utc and random endpoints.
         Do these steps for any JSON, request or response.
             Use snippet freezedClass, then use @freezed menu, then "Json From Freezed"
             then paste,then click the button --> then change class name, file name, path then save.
             Now paste in this
                 import 'package:flutter/foundation.dart';
               to generated file.
             Now use @freezed menu, then "Run Build Runner".
    2.3. Run command
          >>
          flutter pub add http
          <<
    2.4.  New file then paste this code. For random API. (GET http://localhost:3000/p/random)
          >>
              import 'dart:convert';
              import 'package:http/http.dart' as http;
              import 'package:riverpod_annotation/riverpod_annotation.dart';
              import '../model/my_random.dart';

              // Necessary for code-generation to work
              part 'provider.g.dart';

              /// This will create a provider named `activityProvider`
              /// which will cache the result of this function.
              @riverpod
              Future<MyRandom> getMyRandom(GetMyRandomRef ref) async {
                // Using package:http, we fetch a random activity from the Bored API.
                final response = await http.get(Uri.https('localhost:3000', '/p/random'));
                // Using dart:convert, we then decode the JSON payload into a Map data structure.
                final json = jsonDecode(response.body) as Map<String, dynamic>;
                // Finally, we convert the Map into an Activity instance.
                return MyRandom.fromJson(json);
              }
          <<
          Check the pattern should be with this format:
                  @riverpod
                  Result myFunction(MyFunctionRef ref) {
                    <your logic here>
                  }
              myFunction and MyFunctionRef
              xabcd      and XabcdRef

    2.5. Create a widget with data.
         it is simple using these line of code
             final AsyncValue<MyRandom> myRandom = ref.watch(getMyRandomProvider);
           that serves data as a aysncvalue.
           there is a sample in widgets/simples folder.

    Note: Continue from "Going further" in "https://riverpod.dev/docs/essentials/first_request"
    Note: After checkout, just run
             flutter pub get
             flutter pub run build_runner build