gitlab: add bug report template

.gitlab/issue_templates/Bug.md

@@ -0,0 +1,49 @@
+<!--
+Please search the issue tracker for existing bug reports before
+submitting your own.
+-->
+
+## Steps to reproduce
+<!--
+  Please explain the sequence of actions necessary to reproduce
+  the bug
+-->
+
+ 1. ...
+ 2. ...
+ 3. ...
+
+<!--
+  Posting the minimum steps required to reproduce your issue
+  starting from an empty project helps us fix the issue quickly.
+-->
+
+## Current behavior
+<!--
+  Please describe the current behaviour
+-->
+
+## Expected outcome
+<!--
+  Please describe the expected outcome
+-->
+
+## Version information
+<!--
+  Click Help -> About Zrythm to view version information.
+
+  Alternatively, post the output of `zrythm_launch --version`.
+
+  Please mention where you obtained Zrythm (did you use our
+  installers, did you build it yourself, or did you obtain it
+  from your distribution?)
+-->
+
+## Additional information
+<!--
+ - Screenshots and/or screen recordings
+ - Warnings or message printed on the terminal, or the last 100 lines of the log file
+ - Backtrace, if available
+ - Debug information foud in Help -> About Zrythm -> Troubleshooting -> Debugging information
+-->
+