Move README to README.md

README

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-This is the repository of the Dart programming language and its associated
-tools, libraries, and samples.
-
-For license information, please see LICENSE.
-
-You can find more about Dart online at http://dartlang.org or
-http://code.google.com/p/dart.
-
-Here's a brief guide to what's in here:
-
-lib/           Libraries that ship with the Dart runtime (core, html, etc.).
-pkg/           Packages that are not shipped with the core runtime.
-runtime/       Dart VM and code for running it as a standalone app.
-samples/       Sample Dart programs.
-tests/         Automated tests.
-third_party/   External dependencies.
-tools/         Build scripts, text editor support files, etc.
-utils/         Utilities for Dart applications.

README.md

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+# Dart
+
+[Dart][website] is an open-source, scalable programming language, with robust
+libraries and runtimes, for building web, server, and mobile apps.
+
+## Using Dart
+
+Visit the [dartlang.org][website] to learn more about the
+[language][lang], [tools][tools],
+[getting started][codelab], and more.
+
+Browse [pub.dartlang.org][pubsite] for more packages and libraries contributed
+by the community and the Dart team.
+
+## Contributing to Dart
+
+The easiest way to contribute to Dart is to [file issues][dartbug].
+
+You can also contribute patches, as described in [Contributing][contrib].
+
+## License
+
+See [LICENSE][license].
+
+[website]: https://www.dartlang.org
+[license]: https://github.com/dart-lang/sdk/blob/master/LICENSE
+[repo]: https://github.com/dart-lang/sdk
+[lang]: https://www.dartlang.org/docs/dart-up-and-running/ch02.html
+[tools]: https://www.dartlang.org/tools/
+[codelab]: https://www.dartlang.org/codelabs/darrrt/
+[dartbug]: http://dartbug.com
+[contrib]: https://github.com/dart-lang/sdk/wiki/Contributing
+[pubsite]: https://pub.dartlang.org