[snowpatch] [PATCH] docs: add new contribution guidelines document

[Russell Currey]

On Fri, 2016-04-08 at 11:49 +1000, Andrew Donnellan wrote:
> Add CONTRIBUTING.md, a document containing guidelines for contributions to
> snowpatch. Remove existing info from README.md and replace with a link to
> the new guidelines.
> 
> GitHub automatically links to this document when submitting pull
> requests, so it's useful for advising people that we prefer emailed
> patches.
> 
> Closes: #9 ("Add contributing document")
> Suggested-by: Joel Stanley <joel at jms.id.au>
> Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

Applied to master as 65c2f05e3c28793f50f4ffcc7b44365471a51c7b, thanks.