Create config.yml

Disables the "Open a blank issue" option when choosing a template for a new issue.

This should only be merged upon acceptance by the Technical Steering Committee. See o3de/tsc#16

Signed-off-by: Gavin Monroe <71404632+monroegm@users.noreply.github.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false