Add rubocop configo

reference:
rubocop/rubocop#10893 (comment)
https://docs.rubocop.org/rubocop/usage/server.html#restart-server

.rubocop.yml

@@ -0,0 +1,38 @@
+# The behavior of RuboCop can be controlled via the .rubocop.yml
+# configuration file. It makes it possible to enable/disable
+# certain cops (checks) and to alter their behavior if they accept
+# any parameters. The file can be placed either in your home
+# directory or in some project directory.
+#
+# RuboCop will start looking for the configuration file in the directory
+# where the inspected file is and continue its way up to the root directory.
+#
+# See https://docs.rubocop.org/rubocop/configuration
+require:
+  - rubocop-rails
+
+AllCops:
+  NewCops: disable
+  TargetRubyVersion: 3.3.0
+  Exclude:
+    - 'bin/**/*'
+    - 'vendor/**/*'
+    - 'db/**/*'
+    - 'config/**/*'
+    - 'script/**/*'
+    - 'spec/rails_helper.rb'
+  SuggestExtensions: false
+
+Style/Documentation:
+  Enabled: false
+
+Rails/I18nLocaleTexts:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Metrics/BlockLength:
+  AllowedMethods: ['describe', 'context', 'feature', 'scenario', 'let', 'it']
+  Exclude:
+    - 'spec/factories/**/*'