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

diff --git a/.github/SUPPORT.md b/.github/SUPPORT.md
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+### Asking Support Questions
+
+We have an active [discussion forum](https://discourse.gohugo.io) where users and developers can ask questions. Please don't use the GitHub issue tracker to ask questions.