Add RDoc and tasks to the Rakefile.

.gitignore

@@ -6,6 +6,7 @@ Gemfile.lock
 +samples/*.zip.*
 samples/zipdialogui.rb
 coverage
+html/
 pkg/
 .ruby-gemset
 .ruby-version

Rakefile

@@ -2,6 +2,7 @@
 
 require 'bundler/gem_tasks'
 require 'rake/testtask'
+require 'rdoc/task'
 require 'rubocop/rake_task'
 
 task default: :test
@@ -13,4 +14,12 @@ Rake::TestTask.new(:test) do |test|
   test.verbose = true
 end
 
+RDoc::Task.new do |rdoc|
+  rdoc.main = 'README.md'
+  rdoc.rdoc_files.include('README.md', 'lib/**/*.rb')
+  rdoc.options << '--markup=markdown'
+  rdoc.options << '--tab-width=2'
+  rdoc.options << "-t Rubyzip version #{::Zip::VERSION}"
+end
+
 RuboCop::RakeTask.new

rubyzip.gemspec

@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'minitest', '~> 5.4'
   s.add_development_dependency 'rake', '~> 12.3.3'
+  s.add_development_dependency 'rdoc', '~> 6.4.0'
   s.add_development_dependency 'rubocop', '~> 1.12.0'
   s.add_development_dependency 'rubocop-performance', '~> 1.10.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.5.0'