Add rubocop dev dependency

Gemfile

@@ -5,3 +5,4 @@ gemspec
 
 gem 'minitest-proptest', '~> 0.2'
 gem 'rake-compiler', '~> 1.2'
+gem 'rubocop', '~> 1.66'

Gemfile.lock

@@ -6,12 +6,36 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.4.2)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
     minitest (5.22.2)
     minitest-proptest (0.3.0)
       minitest (~> 5)
+    parallel (1.26.3)
+    parser (3.3.5.0)
+      ast (~> 2.4.1)
+      racc
+    racc (1.8.1)
+    rainbow (3.1.1)
     rake (13.1.0)
     rake-compiler (1.2.7)
       rake
+    regexp_parser (2.9.2)
+    rubocop (1.66.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.4, < 3.0)
+      rubocop-ast (>= 1.32.2, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.32.3)
+      parser (>= 3.3.1.0)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (2.6.0)
 
 PLATFORMS
   ruby
@@ -20,6 +44,7 @@ PLATFORMS
 DEPENDENCIES
   minitest-proptest (~> 0.2)
   rake-compiler (~> 1.2)
+  rubocop (~> 1.66)
   simd!
 
 BUNDLED WITH