Add README

README.md

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+# 99 Bottles
+
+## Installing Ruby
+
+### Windows
+
+There's an installer, it's easy.
+http://rubyinstaller.org/
+
+### Mac
+
+Newer macs ship with a usable version of Ruby.
+
+Try `ruby -v` in a terminal window, and if it's 1.9.x or 2.x you're fine.
+
+http://www.railstutorial.org/book/beginning#sec-install_ruby
+http://tutorials.jumpstartlab.com/topics/environment/environment.html
+http://docs.railsbridge.org/installfest/macintosh
+
+### Linux
+
+Ubuntu: http://docs.railsbridge.org/installfest/linux
+https://www.ruby-lang.org/en/installation/