added a note on making a quick start.

following up on @cboettig question in #55
(Saw your edits to the wiki just as I was leaving work, very nice.  And commented in another thread that a hook needs to be right here.)

I appreciate that you are very concerned about the RStudio container.  It is however only one of several containers.

Would you consider rewording is slightly, making it more general and stating that instructions are in the wiki?