Added Rubocop harness to enforce Ruby code style
diff --git a/lib/rb/Gemfile.linters b/lib/rb/Gemfile.linters
new file mode 100644
index 0000000..00d4d22
--- /dev/null
+++ b/lib/rb/Gemfile.linters
@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem 'rubocop', '~> 1.82.0'
+gem 'rubocop-performance', '~> 1.26.1'
+gem 'rubocop-rspec', '~> 3.8.0'