Update README

Author: swift-kim

README.md

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 # plugins
+
+This repo contains Flutter plugins maintained by the flutter-tizen team. The plugins in this repo extend existing first and third-party plugins by adding Tizen-specific platform implementation. See [Federated plugins](https://flutter.dev/docs/development/packages-and-plugins/developing-packages#federated-plugins) from the Flutter doc for the detailed design concept. To build Flutter applications with plugins, use the [flutter-tizen](https://github.com/flutter-tizen/flutter-tizen) tool.
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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.
+
+| Tizen plugin | Original | Pub | Endorsed |
+|-|-|:-:|:-:|
+| [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 |
+| [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 |