Create 2014-12-18-ruby-2-2-0-rc1-released.md

This is still draft.
This number did not change since 2.2.0-preview1 post, should this number be updated?

[Ruby 2.2.0-preview1 Released](https://www.ruby-lang.org/en/news/2014/09/18/ruby-2-2-0-preview1-released/)
[Ruby 2.2.0-preview1 Released](https://www.ruby-lang.org/en/news/2014/09/18/ruby-2-2-0-preview1-released/)