Add .rspec and .rubocop.yml

.rspec

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+--color
+--require spec_helper
+--order random
+--warnings

.rubocop.yml

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+# this file is managed by dry-rb/devtools project
+
+AllCops:
+  TargetRubyVersion: 2.7
+  Exclude:
+    - spec/support/coverage.rb
+    - spec/support/warnings.rb
+    - spec/support/rspec_options.rb
+    - Gemfile.devtools
+    - "*.gemspec"
+
+Layout/SpaceAroundMethodCallOperator:
+  Enabled: false
+
+Layout/SpaceInLambdaLiteral:
+  Enabled: false
+
+Layout/MultilineMethodCallIndentation:
+  Enabled: true
+  EnforcedStyle: indented
+
+Layout/FirstArrayElementIndentation:
+  EnforcedStyle: consistent
+
+Layout/SpaceInsideHashLiteralBraces:
+  Enabled: true
+  EnforcedStyle: no_space
+  EnforcedStyleForEmptyBraces: no_space
+
+Layout/LineLength:
+  Max: 100
+  Exclude:
+    - "spec/**/*_spec.rb"
+
+Lint/BooleanSymbol:
+  Enabled: false
+
+Lint/ConstantDefinitionInBlock:
+  Exclude:
+    - "spec/**/*_spec.rb"
+
+Lint/RaiseException:
+  Enabled: false
+
+Lint/StructNewOverride:
+  Enabled: false
+
+Lint/SuppressedException:
+  Exclude:
+    - "spec/spec_helper.rb"
+
+Naming/PredicateName:
+  Enabled: false
+
+Naming/FileName:
+  Exclude:
+    - "lib/*-*.rb"
+
+Naming/MethodName:
+  Enabled: false
+
+Naming/MemoizedInstanceVariableName:
+  Enabled: false
+
+Metrics/MethodLength:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: false
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/AbcSize:
+  Max: 25
+
+Metrics/CyclomaticComplexity:
+  Enabled: true
+  Max: 12
+
+Style/ExponentialNotation:
+  Enabled: false
+
+Style/HashEachMethods:
+  Enabled: false
+
+Style/HashTransformKeys:
+  Enabled: false
+
+Style/HashTransformValues:
+  Enabled: false
+
+Style/AccessModifierDeclarations:
+  Enabled: false
+
+Style/Alias:
+  Enabled: true
+  EnforcedStyle: prefer_alias_method
+
+Style/AsciiComments:
+  Enabled: false
+
+Style/BlockDelimiters:
+  Enabled: false
+
+Style/ClassAndModuleChildren:
+  Exclude:
+    - "spec/**/*_spec.rb"
+
+Style/ConditionalAssignment:
+  Enabled: false
+
+Style/DateTime:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
+Style/EachWithObject:
+  Enabled: false
+
+Style/FormatString:
+  Enabled: false
+
+Style/GuardClause:
+  Enabled: false
+
+Style/IfUnlessModifier:
+  Enabled: false
+
+Style/Lambda:
+  Enabled: false
+
+Style/LambdaCall:
+  Enabled: false
+
+Style/ParallelAssignment:
+  Enabled: false
+
+Style/StabbyLambdaParentheses:
+  Enabled: false
+
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+  ConsistentQuotesInMultiline: false
+
+Style/StringLiteralsInInterpolation:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+Style/SymbolArray:
+  Exclude:
+    - "spec/**/*_spec.rb"
+
+Style/TrailingUnderscoreVariable:
+  Enabled: false
+
+Style/MultipleComparison:
+  Enabled: false