add README.md

Author: tsirysndr

README.md

@@ -0,0 +1,6 @@
+# FluentCI CI demo for Ruby on Rails
+
+[![ci](https://github.com/fluentci-demos/fluentci-demo-ruby-rails/actions/workflows/ci.yml/badge.svg)](https://github.com/fluentci-demos/fluentci-demo-ruby-rails/actions/workflows/ci.yml)
+
+This is an example application and CI pipeline showing how to build, test a [Ruby on Rails](https://rubyonrails.org/) application using FluentCI.
+