Add ISSUE_TEMPLATE config.yml with Question link

This commit adds a config.yml for GitHub issues
containing a Question link to the forums.

Author: russcam

.github/ISSUE_TEMPLATE/config,yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Question
+    url: https://discuss.elastic.co/c/elasticsearch
+    about: Ask (and answer) questions here