Examples with ruby on rails

[paulohsilvavieira]

I'm trying to configure nvim-dap-ruby for rails but I can't find much information on how to do this, is there any way to update the doc to show how to configure it to debug rails app?

[tttffff]

I've opened a PR for this #37

It's in the usage section https://github.com/tttffff/nvim-dap-ruby/tree/add_rails_to_readme#ruby-on-rails