Add yard, yardstick and yard-junk to document the gem

.gitignore

@@ -1,8 +1,10 @@
 /.bundle/
 /.yardoc
 /_yardoc/
+/.yardocck
 /coverage/
 /doc/
+/measurements/
 /pkg/
 /spec/reports/
 /tmp/

.yardstick.yml

@@ -0,0 +1,22 @@
+threshold: 100
+rules:
+  ApiTag::Presence:
+    enabled: true
+  ApiTag::Inclusion:
+    enabled: true
+  ApiTag::ProtectedMethod:
+    enabled: true
+  ApiTag::PrivateMethod:
+    enabled: true
+  ExampleTag:
+    enabled: true
+  ReturnTag:
+    enabled: true
+  Summary::Presence:
+    enabled: true
+  Summary::Length:
+    enabled: false
+  Summary::Delimiter:
+    enabled: true
+  Summary::SingleLine:
+    enabled: false

Rakefile

@@ -4,13 +4,27 @@ require 'bundler/audit/task'
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
+require 'yaml'
+require 'yard/rake/yardoc_task'
+require 'yard-junk/rake'
+require 'yardstick/rake/measurement'
+require 'yardstick/rake/verify'
+
+yardstick_options = YAML.load_file('.yardstick.yml')
 
 Bundler::Audit::Task.new
 RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new
+YARD::Rake::YardocTask.new
+YardJunk::Rake.define_task
+Yardstick::Rake::Measurement.new(:yardstick_measure, yardstick_options)
+Yardstick::Rake::Verify.new
 
 task default: %i[spec rubocop]
 
+# Remove the report on rake clobber
+CLEAN.include('measurements', 'doc', '.yardoc', 'tmp')
+
 # Delete these files and folders when running rake clobber.
 CLOBBER.include('coverage', '.rspec_status')
 

nostr.gemspec

@@ -46,4 +46,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-rspec', '2.16'
   spec.add_development_dependency 'simplecov', '~> 0.22'
   spec.add_development_dependency 'simplecov-console', '~> 0.9'
+  spec.add_development_dependency 'yard', '~> 0.9'
+  spec.add_development_dependency 'yard-junk', '~> 0.0.9'
+  spec.add_development_dependency 'yardstick', '~> 0.9'
 end