Add default issue template

.gitlab/issue_templates/default.md

@@ -0,0 +1,24 @@
+## Issue description
+
+(Summarize the bug encountered)
+
+## Steps to reproduce
+
+(How can the issue be reproduced)
+
+## What is the current bug behavior?
+
+(What actually happens)
+
+## What is the expected correct behavior?
+
+(What you should see instead)
+
+## Relevant logs and/or screenshots
+
+(run `journalctl -b -u supergfxd > ~/supergfxd.log` and attach `~/supergfxd.log`)
+
+(Paste any relevant logs - use code blocks (```) to format console output, logs, and code, as
+it's very hard to read otherwise.)
+
+/label ~bug ~reproducable ~needs-investigation