add introduction.md

clarifying notes for new users
All paths lead to nirvana
      From: Code School Kiddo <notifications@github.com>
 To: deadlyvipers/dojo_rules <dojo_rules@noreply.github.com> 
Cc: mgl1018 <mgl1018@yahoo.com> 
 Sent: Friday, November 28, 2014 10:56 AM
 Subject: Re: [dojo_rules] add introduction.md (#2485)
   
In introduction.md:> @@ -0,0 +1 @@
> +hello
Looks good! Could you also please mention your favorite Code School path in your introduction? This could be Ruby, JavaScript, HTML & CSS, iOS or Electives.—
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