feat(frontier): init package

packages/serinus_frontier/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

packages/serinus_frontier/CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

packages/serinus_frontier/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/`.

packages/serinus_frontier/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

packages/serinus_frontier/bin/serinus_frontier.dart

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

packages/serinus_frontier/lib/serinus_frontier.dart

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