chore: add rubocop

.rubocop.yml

@@ -0,0 +1,41 @@
+require: 
+  - rubocop-performance
+  - rubocop-jekyll
+  - rubocop-md
+
+inherit_gem:
+  rubocop-jekyll: .rubocop.yml
+
+Markdown:
+  # Whether to run RuboCop against non-valid snippets
+  WarnInvalid: true
+  # Whether to lint codeblocks without code attributes
+  Autodetect: false
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Layout/LineEndStringConcatenationIndentation: # (new in 1.18)                                                                                                    
+  Enabled: true                                                                                                                                                  
+Lint/EmptyInPattern: # (new in 1.16)                                                                                                                             
+  Enabled: true                                                                                                                                                  
+Naming/InclusiveLanguage: # (new in 1.18)
+  Enabled: true
+Style/InPatternThen: # (new in 1.16)
+  Enabled: true
+Style/MultilineInPatternThen: # (new in 1.16)
+  Enabled: true
+Style/QuotedSymbols: # (new in 1.16)
+  Enabled: true
+Performance/ConcurrentMonotonicTime: # (new in 1.12)
+  Enabled: true
+Performance/MapCompact: # (new in 1.11)
+  Enabled: true
+Performance/MapMethodChain: # (new in 1.19)
+  Enabled: true
+Performance/RedundantEqualityComparisonBlock: # (new in 1.10)
+  Enabled: true
+Performance/RedundantSplitRegexpArgument: # (new in 1.10)
+  Enabled: true
+Performance/StringIdentifierArgument: # (new in 1.13)
+  Enabled: true

Gemfile

@@ -39,3 +39,7 @@ gem "csv", "~> 3.3"
 gem "base64", "~> 0.2.0"
 
 gem "bigdecimal", "~> 3.1"
+
+gem "rubocop-jekyll", "~> 0.12.0"
+
+gem "rubocop-md", "~> 1.2"

Gemfile.lock

@@ -14,6 +14,7 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
+    ast (2.4.2)
     base64 (0.2.0)
     bigdecimal (3.1.8)
     coffee-script (2.4.1)
@@ -233,15 +234,41 @@ GEM
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
+    parallel (1.26.3)
+    parser (3.3.5.0)
+      ast (~> 2.4.1)
+      racc
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (5.1.1)
     racc (1.8.1)
+    rainbow (3.1.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
+    regexp_parser (2.9.2)
     rexml (3.3.7)
     rouge (3.30.0)
+    rubocop (1.18.4)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.8.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.32.3)
+      parser (>= 3.3.1.0)
+    rubocop-jekyll (0.12.0)
+      rubocop (~> 1.18.0)
+      rubocop-performance (~> 1.2)
+    rubocop-md (1.2.2)
+      rubocop (>= 1.0)
+    rubocop-performance (1.19.1)
+      rubocop (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
+    ruby-progressbar (1.13.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -275,6 +302,8 @@ DEPENDENCIES
   http_parser.rb (~> 0.6.0)
   jekyll-feed (~> 0.12)
   minima (~> 2.5)
+  rubocop-jekyll (~> 0.12.0)
+  rubocop-md (~> 1.2)
   tzinfo (>= 1, < 3)
   tzinfo-data
   wdm (~> 0.1.1)