Update README.md

DISCLAIMER----This routine and info wasn´t created for me!. It´s available in https://www.ng.bluemix.net/docs/#starters/rubysinatra/index.html#rubyhelloworld DISCLAIMER----This routine and info wasn´t created for me!. It´s available in https://www.ng.bluemix.net/docs/#starters/rubysinatra/index.html#rubyhelloworld 
My purpose is to invite all github users to know IBM Bluemix Platform.

My purpose is to invite all github users to know IBM Bluemix Platform.