Ask for an example project for bug reports

* Bugs reported in the GitLab Issue trackers should be reproducible
* Asking reporters to reproduce on GitLab.com is reasonable
  * It lets us know whether the issue still exists in latest
  * It ensures that the steps to reproduce are solid
  * It gives Developers a live example to work from
  * Reporter can verify the fix in the example project once shipped

[skip ci]

.gitlab/issue_templates/Bug.md

@@ -20,6 +20,12 @@ Please remove this notice if you're confident your issue isn't a duplicate.
 (How one can reproduce the issue - this is very important)
+### Example Project
+
+(If possible, please create an example project here on GitLab.com that exhibits the problematic behaviour, and link to it here in the bug report)
+
+(If you are using an older version of GitLab, this will also determine whether the bug has been fixed in a more recent version)
+
 ### What is the current *bug* behavior?
 (What actually happens)

changelogs/unreleased/issue-template-reproduce-in-example-project.yml

+---
+title: Ask for an example project for bug reports
+merge_request:
+author: