feat: add cli sample

cli_sample/.gitignore

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+# Files and directories created by pub
+.dart_tool/
+.packages
+
+# Conventional directory for build outputs
+build/
+
+# Directory created by dartdoc
+doc/api/

cli_sample/CHANGELOG.md

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+## 1.0.0
+
+- Initial version, created by Stagehand

cli_sample/README.md

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+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.
+
+Created from templates made available by Stagehand under a BSD-style
+[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).

cli_sample/analysis_options.yaml

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+# Defines a default set of lint rules enforced for
+# projects at Google. For details and rationale,
+# see https://github.com/dart-lang/pedantic#enabled-lints.
+include: package:pedantic/analysis_options.yaml
+
+# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
+# Uncomment to specify additional rules.
+# linter:
+#   rules:
+#     - camel_case_types
+
+analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

cli_sample/bin/cli_sample.dart

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+import 'package:cli_sample/cli_sample.dart' as cli_sample;
+
+void main(List<String> arguments) {
+  print('Hello world: ${cli_sample.calculate()}!');
+}

cli_sample/lib/cli_sample.dart

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+int calculate() {
+  return 6 * 7;
+}

cli_sample/pubspec.yaml

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+name: cli_sample
+description: A sample command-line application.
+# version: 1.0.0
+# homepage: https://www.example.com
+
+environment:
+  sdk: '>=2.8.1 <3.0.0'
+
+#dependencies:
+#  path: ^1.7.0
+
+dev_dependencies:
+  pedantic: ^1.9.0
+  test: ^1.14.4

cli_sample/test/cli_sample_test.dart

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+import 'package:cli_sample/cli_sample.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('calculate', () {
+    expect(calculate(), 42);
+  });
+}