Create SUPPORT.md
Create SUPPORT.md

To help cut down on the number of general questions, it'd be good to add a `SUPPORT.md` to the `.github` folder.

A link to this would then be displayed automatically when a user opens a New Issue (https://github.com/gohugoio/hugo/issues/new).

To see an example of this take a look at: https://github.com/twbs/bootstrap/issues/new
anthonyfok/hugo,fedelibre/hugo,mdhender/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo,fedelibre/hugo,gohugoio/hugo,anthonyfok/hugo,gohugoio/hugo,mdhender/hugo,anthonyfok/hugo,fedelibre/hugo,gohugoio/hugo