[Samba] Wiki should have Readme First

[steve]

On Thu, 2014-03-13 at 12:43 +0100, Klaus Hartnegg wrote:

> The accepted practice seems to be, set up Samba 4 for authorisation and
> then set up a separate Samba3 fileserver.
> 

Hi
Very confusing. Samba3 is no longer developed. Surely we need to
recommend Samba4 for both rôles? By all means, separate them.

What does a Samba3 have that Samba4 doesn't?
Cheers,
Steve