Add merge request templates

Author: Mordil

.gitlab/merge_request_templates/Feature.md

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+## Motivation
+
+_[Provide context for the changes. Why are you making these changes? What is the problem you're trying to solve?_
+
+## Modifications
+
+_[Provide an overview the changes you've made]_
+
+## Result
+
+_[After your change, what will change from the perspective of end users?]_
+
+## Checklist
+
+- [ ] Copyright headers in new files (see [CONTRIBUTING.md](https://gitlab.com/Mordil/RediStack/-/blob/master/CONTRIBUTING.md))
+- [ ] Unit tests added
+- [ ] API Documentation comments

.gitlab/merge_request_templates/Patch.md

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+_[One sentence description of the bug being fixed]_
+
+**If the bug being fixed has an issue written**
+
+Fixes _[GitLab Issue link]_.
+
+**If the bug being fixed does NOT have an issue written**
+
+## Expected Results
+_[what you expected to happen]_
+
+## Actual Results
+_[what actually happened]_
+
+## Steps to Reproduce
+
+1. ...
+2. ...
+
+## Checklist:
+
+- [ ] Copyright headers in new files (see [CONTRIBUTING.md](https://gitlab.com/Mordil/RediStack/-/blob/master/CONTRIBUTING.md))
+- [ ] Unit test case to prevent the bug in the future