Add .rubocop.yml to git

.gitignore

@@ -8,4 +8,4 @@
 /spec/reports/
 /tmp/
 spec/examples.txt
-.rubocop.yml
+

.rubocop.yml

@@ -0,0 +1,59 @@
+AllCops:
+  TargetRubyVersion: 2.4
+
+Style/EachWithObject:
+  Enabled: false
+
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: single_quotes
+
+Style/Alias:
+  Enabled: false
+
+Style/LambdaCall:
+  Enabled: false
+
+Style/StabbyLambdaParentheses:
+  Enabled: false
+
+Style/FormatString:
+  Enabled: false
+
+Layout/SpaceInLambdaLiteral:
+  Enabled: false
+
+Layout/MultilineMethodCallIndentation:
+  Enabled: true
+  EnforcedStyle: indented
+
+Metrics/LineLength:
+  Max: 100
+
+Metrics/MethodLength:
+  Max: 22
+
+Metrics/ClassLength:
+  Max: 150
+
+Metrics/AbcSize:
+  Max: 20
+
+Metrics/BlockLength:
+  Enabled: true
+  Exclude:
+    - 'spec/**/*_spec.rb'
+
+Metrics/CyclomaticComplexity:
+  Enabled: true
+  Max: 10
+
+Lint/BooleanSymbol:
+  Enabled: false
+
+Style/AccessModifierDeclarations:
+  Enabled: false
+
+Style/BlockDelimiters:
+  EnforcedStyle: semantic
+