[CentOS-docs] Create page about rebuilding SRPMS and preparing RPM environment

[Karanbir Singh]

Alan Bartlett wrote:
>     Alan Bartlett wrote:
>      > By all means refer to it but please do not modify it.
>
>     Why?
>
>
> Because a considerable amount of work has been put into maintaining the
> three inter-related pages (of which that is one) and they are currently
> maintained.

That is no reason to not modify it, if the entire setup that these pages 
belong under is going to be be refactored, by all means edit and hack 
these pages into what is a more appropriate location with the right sort 
of content in there.

- KB