(GH-87) Remind new users that there are some rules.

They would otherwise never read them, because they can complete the process
of getting to know Chocolatey to publishing a package without ever even
knowing there are rules spelled out.

See https://github.com/chocolatey/chocolatey/issues/342#issuecomment-50500319
Merge branch 'patch-2'

* patch-2:
  (GH-87) Remind new users that there are some rules.