chore: add gitlab issue templates for bug and feature requests

.gitlab/issue_templates/bug.md

+# Bug
+
+## Description
+
+Describe the problem, what were you doing when you noticed the bug?
+
+Provide any steps possible used to reproduce the error (ideally in an isolated fashion).
+
+## BigBang Version
+
+What version of BigBang were you running?

.gitlab/issue_templates/feature_request.md

+# Feature Request
+
+## Why
+
+What is the use case for the feature you are requesting? What are you trying to solve?
+
+The more detail here the better!
+
+## Proposed Solution
+
+If possible, provide details on the proposed solution.
+
+If your proposed solution _changes_ the existing behavior of a feature, please outline why your approach is recommended/better.