Update README (#1)

Author: swift-kim

README.md

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 # plugins
+
+This repo contains Flutter plugins maintained by the flutter-tizen team. We're in process of adding Tizen platform support to existing first and third-party plugins on [pub.dev](https://pub.dev) based on their popularity. If the plugin you're looking for isn't implemented for Tizen yet, consider filing an [issue](../../issues) or creating a package by yourself. (We welcome your pull requests!)
+
+To build Flutter applications with plugins, use the [flutter-tizen](https://github.com/flutter-tizen/flutter-tizen) tool.
+
+For how to extend existing plugins for Tizen, see [Writing custom platform-specific code](https://flutter.dev/docs/development/platform-integration/platform-channels) and [Federated plugins](https://flutter.dev/docs/development/packages-and-plugins/developing-packages#federated-plugins) from the Flutter docs. If the original plugin uses the federated plugins approach, you can implement its platform interface either in Dart (inheriting directly) or C++ (using a fallback method channel).
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+## List of packages
+
+The _"non-endorsed"_ status means that the plugin is not endorsed by the original author. In such case, you must set both `foobar` and `foobar_tizen` package dependencies in `pubspec.yaml` file to achieve full functionality.
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+| Tizen plugin | Original | Pub | Endorsed |
+|-|-|:-:|:-:|
+| [**integration_test_tizen**](packages/integration_test) | [integration_test](https://github.com/flutter/plugins/tree/master/packages/integration_test) (1st-party) | [![pub package](https://img.shields.io/pub/v/integration_test_tizen.svg)](https://pub.dev/packages/integration_test_tizen) | No |
+| [**path_provider_tizen**](packages/path_provider) | [path_provider](https://github.com/flutter/plugins/tree/master/packages/path_provider) (1st-party) | [![pub package](https://img.shields.io/pub/v/path_provider_tizen.svg)](https://pub.dev/packages/path_provider_tizen) | No |
+| [**sensors_tizen**](packages/sensors) | [sensors](https://github.com/flutter/plugins/tree/master/packages/sensors) (1st-party) | [![pub package](https://img.shields.io/pub/v/sensors_tizen.svg)](https://pub.dev/packages/sensors_tizen) | No |
+| [**shared_preferences_tizen**](packages/path_provider) | [shared_preferences](https://github.com/flutter/plugins/tree/master/packages/shared_preferences) (1st-party) | [![pub package](https://img.shields.io/pub/v/shared_preferences_tizen.svg)](https://pub.dev/packages/shared_preferences_tizen) | No |
+| [**url_launcher_tizen**](packages/url_launcher) | [url_launcher](https://github.com/flutter/plugins/tree/master/packages/url_launcher) (1st-party) | [![pub package](https://img.shields.io/pub/v/url_launcher_tizen.svg)](https://pub.dev/packages/url_launcher_tizen) | No |