DOC: add Gitlab templates (MR + issue)

.gitlab/issue_templates/Bug.md

+## Summary
+
+<!-- Briefly summarize the bug -->
+
+
+## Steps to reproduce
+
+<!-- What do you need to do to reproduce the bug? -->
+
+
+## Actual behavior
+
+<!-- What actually happens -->
+
+
+## Expected behavior
+
+<!-- What you should see instead -->
+
+
+## Relevant logs and/or screenshots
+
+<!-- Paste the logs inside of the code blocks (```)
+     below so it would be easier to read.           -->
+
+<details>
+<summary> Log </summary>
+
+```sh
+Add the log here
+```
+</details>
+
+
+## Possible fixes
+
+<!-- If you can, link to the line of code
+     that might be responsible for the problem      -->
+
+
+
+/label ~BUG

.gitlab/issue_templates/Feature Proposal.md

+## Description
+
+<!-- Include problem, use cases, benefits, and/or goals -->
+
+## Proposal
+
+
+
+## Links to related issues and merge requests / references
+
+<!-- Please paste a link of the related issues or/and merge requests -->
+
+
+
+/label ~feature

.gitlab/merge_request_templates/Documentation.md

+<!-- Mention "documentation" or "docs" in the MR title -->
+
+## What does this MR do?
+
+<!-- Briefly describe what this MR is about. -->
+
+
+## Related issues
+
+<!-- Link related issues below.
+     Insert the issue link or reference after the word "Closes"
+     if merging this should automatically close it.               -->
+
+
+
+/label ~documentation