Add pry codenvy notes

Author: drmohundro

SETUP.md

@@ -1,13 +1,21 @@
 ## Preferred OS: MacOS or Linux
 
-##Software:
+## Software:
+
 - Ruby 2.3.3 downloaded from https://www.ruby-lang.org/en/downloads/ or using operating system package manager
 - Latest version of bundler installed via `gem install bundler` inside of your Ruby 2.3 install
 - sqlite3 for a development database (https://sqlite.org/download.html)
+- Version of pry for a good REPL experience (via `gem install pry`)
 - `rails new sample_app` to confirm basic gem setup succeeds.
 - RubyInstaller DevKit if Windows users run into trouble with a Rails setup: http://rubyinstaller.org/add-ons/devkit/
 - A programmer's text editor:  Atom, VSCode, Sublime, TextMate, Vim, Emacs, etc.
-Did you want the hour by hour schedule for the website as well? 
+Did you want the hour by hour schedule for the website as well?
 
 ### Alternative setup for users without access to a solid Ruby install
-- [C9.io](https://c9.io/) workspaces to be configured and distributed by instructors before the start of course.
+
+- [Codenvy.io](https://codenvy.io) workspaces to be configured and distributed by instructors before the start of course.
+
+```bash
+gem install pry
+gem install rb-readline
+```