CONTRIBUTING: provide a template for new issues

_maybe_ we could even automate this to populate and complain in some
situations.

I see https://github.com/isaacs/github/issues/99 that is old and needs
some love from @github ...

@tianon @unclejack @shykes 

Signed-off-by: Vincent Batts <vbatts@redhat.com>
I’m wondering if it might make sense to curl a script which executes these, and allows them to paste it in?

> On Oct 30, 2014, at 7:56 PM, Vincent Batts <notifications@github.com> wrote:
> 
> In CONTRIBUTING.md:
> 
> > @@ -51,6 +51,45 @@ Please also include the steps required to reproduce the problem if
> >  possible and applicable.  This information will help us review and fix
> >  your issue faster.
> >  
> > +### Template
> > +
> > +```
> > +Description of problem:
> > +
> > +
> > +`docker version`:
> > +
> > +
> > +`docker info`:
> > +
> > +
> > +`uname -a`:
> presumably client and server are nearby. I guess that is not always the case. and -a gives more than the -r kernel version that is in docker info
> 
> —
> Reply to this email directly or view it on GitHub <https://github.com/docker/docker/pull/8845/files#r19649598>.
>