Add flutter getting started (#67)

Wrote details to the flutter getting started part of the readme.

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hive/README.md

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 ## Hive ❤️ Flutter
 
-Hive was written with Flutter in mind. It is a perfect fit if you need a lightweight datastore for your app. Here is a sample how that may look like:
+### Getting started
+To get started using Hive in a Flutter project, add the following dependencies to your `pubspec.yaml`. Use the latest version instead of `[version]`.
+
+[![Core version](https://img.shields.io/pub/v/hive?label=hive)](https://pub.dev/packages/hive) [![Generator version](https://img.shields.io/pub/v/hive_generator.svg?label=hive_generator)](https://pub.dev/packages/hive_generator) [![Build runner version](https://img.shields.io/pub/v/build_runner.svg?label=build_runner)](https://pub.dev/packages/build_runner) [![Hive Flutter version](https://img.shields.io/pub/v/hive_flutter?label=hive_flutter)](https://pub.dev/packages/hive_flutter)
+
+```yaml
+dependencies:
+  hive: ^[version]
+  hive_flutter: ^[version]
+
+dev_dependencies:
+  hive_generator: ^[version]
+  build_runner: ^[version]
+```
+
+### Example in Flutter
+Hive was written with Flutter in mind. It is a perfect fit if you need a lightweight datastore for your app. After adding the required dependencies to your `pubspec.yaml`,you need import the following dependencies:
+
+```dart
+import 'package:hive/hive.dart';
+import 'package:hive_flutter/hive_flutter.dart';
+```
+
+Afterwards, you are able to use Hive in your projects. This may look like:
 
 ```dart
 class SettingsPage extends StatelessWidget {