[doc] Add an example.dart file (#64)

Pana suggests to add an example.dart file here: https://pub.dev/packages/yaml#-analysis-tab- Closes #45
dart-lang · Feb 24, 2020 · 305ae2f · 305ae2f
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diff --git a/example/example.dart b/example/example.dart
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+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:yaml/yaml.dart';
+
+void main() {
+  var doc = loadYaml("YAML: YAML Ain't Markup Language");
+  print(doc['YAML']);
+}