Merge pull request #490 from seanpdoyle/mention-rubydocs-in-readme

Mention RubyDoc page in README

README.md

@@ -127,6 +127,12 @@ import "@hotwired/turbo-rails"
 
 You can watch [the video introduction to Hotwire](https://hotwired.dev/#screencast), which focuses extensively on demonstrating Turbo in a Rails demo. Then you should familiarize yourself with [Turbo handbook](https://turbo.hotwired.dev/handbook/introduction) to understand Drive, Frames, and Streams in-depth. Finally, dive into the code documentation by starting with [`Turbo::FramesHelper`](https://github.com/hotwired/turbo-rails/blob/main/app/helpers/turbo/frames_helper.rb), [`Turbo::StreamsHelper`](https://github.com/hotwired/turbo-rails/blob/main/app/helpers/turbo/streams_helper.rb), [`Turbo::Streams::TagBuilder`](https://github.com/hotwired/turbo-rails/blob/main/app/models/turbo/streams/tag_builder.rb), and [`Turbo::Broadcastable`](https://github.com/hotwired/turbo-rails/blob/main/app/models/concerns/turbo/broadcastable.rb).
 
+### RubyDoc Documentation
+
+For the API documentation covering this gem's classes and packages, [visit the
+RubyDoc page][].
+
+[visit the RubyDoc page](https://rubydoc.info/github/hotwired/turbo-rails/main)
 
 ## Compatibility with Rails UJS