tour: Updated readme to specify commands needed for newbies.

Added the path to where this package was installed and the command to start the web server.
It was not intuitive to me and I thought this might help others.

Change-Id: Ifbc850d5ad909b5bdf6e3a4b28b14dfad2727786
Reviewed-on: https://go-review.googlesource.com/14920
Reviewed-by: Andrew Gerrand <adg@golang.org>
1 file changed