Add yard

Author: sue445

.yardopts

@@ -0,0 +1,6 @@
+--markup markdown
+--no-private
+--hide-void-return
+-
+CHANGELOG.md
+LICENSE.txt

ruby_header_parser.gemspec

@@ -43,6 +43,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec-temp_dir"
   spec.add_development_dependency "rubocop"
   spec.add_development_dependency "rubocop_auto_corrector"
+  spec.add_development_dependency "yard"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html