Add issue and merge request templates

.gitlab/issue_templates/Bug.md

+### Summary
+<!-- Explain the bug -->
+
+### Steps to Reproduce
+<!-- The steps that anyone can follow to get the bug -->
+1.
+2.
+3.
+
+### Possible Fix
+<!-- If you have a hunch on what the problem is and might know how to fix it,
+     enter this here -->
+
+### Logs
+<!-- If possible, add a log file here -->