try ruby
@ -872,6 +872,7 @@ See also [TeX](#tex)
* [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/)
* [Ruby Essentials](http://www.techotopia.com/index.php/Ruby_Essentials)
* [Ruby Learning](http://rubylearning.com/)
* [Try Ruby](http://tryruby.org/)
###Ruby on Rails