Add StackOverflow advice to github template (#735)

* Add stack-overflow advice
* Review edits

.github/issue_template.md

@@ -3,6 +3,11 @@ Have you read Amber's Code of Conduct? By filing an Issue, you are expected to c
 Do you want to ask a question? Are you looking for support? The Amber message board is the best place for getting support: https://gitter.im/amberframework/amber
 -->
 
+### Submitting questions
+
+- If the question is something like "how do I do X?", consider using [StackOverflow](http://stackoverflow.com/questions/tagged/amber-framework)
+- If the question is specific to another shard, please post an issue to the shards issue tracking system.
+
 ### Description
 
 [Description of the issue]