Rubocop starting config

.rubocop.yml

@@ -0,0 +1,14 @@
+require:
+  - rubocop-performance
+  - rubocop-minitest
+
+AllCops:
+  TargetRubyVersion: ~
+  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
+  # to ignore them, so only the ones explicitly set in this file are enabled.
+  DisabledByDefault: true
+  SuggestExtensions: false
+
+Performance:
+  Exclude:
+    - 'test/**/*'

Gemfile

@@ -2,3 +2,7 @@ source 'https://rubygems.org/'
 
 gem 'minitest'
 gem 'rake'
+
+gem 'rubocop', require: false
+gem 'rubocop-minitest', require: false
+gem 'rubocop-performance', require: false

Gemfile.lock

@@ -1,8 +1,35 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.4.2)
+    json (2.6.2)
     minitest (5.14.4)
+    parallel (1.22.1)
+    parser (3.1.3.0)
+      ast (~> 2.4.1)
+    rainbow (3.1.1)
     rake (13.0.4)
+    regexp_parser (2.6.1)
+    rexml (3.2.5)
+    rubocop (1.39.0)
+      json (~> 2.3)
+      parallel (~> 1.10)
+      parser (>= 3.1.2.1)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.23.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.24.0)
+      parser (>= 3.1.1.0)
+    rubocop-minitest (0.24.0)
+      rubocop (>= 0.90, < 2.0)
+    rubocop-performance (1.15.1)
+      rubocop (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
+    ruby-progressbar (1.11.0)
+    unicode-display_width (2.3.0)
 
 PLATFORMS
   x86_64-darwin-20
@@ -11,6 +38,9 @@ PLATFORMS
 DEPENDENCIES
   minitest
   rake
+  rubocop
+  rubocop-minitest
+  rubocop-performance
 
 BUNDLED WITH
   2.2.22

README.md

@@ -7,6 +7,7 @@ A template for your Ruby project!
 * Basic project structure 
 * Rakefile and test helper to run tests
 * Github Action workflow 
+* Rubocop basic configuration
 
 # Set up
 
@@ -15,3 +16,7 @@ Run `bundle install`
 # Testing
 
 Run `rake test` 
+
+# Linter
+
+Run `bundle exec rubocop .`