Add example project

example/.gitignore

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+# Files and directories created by pub.
+/.dart_tool/
+/.packages
+
+/.idea/

example/analysis_options.yaml

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+# https://pub.dev/packages/yumemi_lints
+include: package:yumemi_lints/dart/2.17.0/recommended.yaml

example/main.dart

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+void main() {}

example/pubspec.lock

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+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  yumemi_lints:
+    dependency: "direct dev"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "1.0.0"
+sdks:
+  dart: ">=2.17.0 <3.0.0"

example/pubspec.yaml

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+name: example
+description: An example of yumemi_lints.
+version: 1.0.0
+publish_to: none
+
+environment:
+  sdk: '>=2.17.0 <3.0.0'
+
+dev_dependencies:
+  yumemi_lints:
+    path: ..