Define a pr template to encourage thorough pr descriptions

pull_request_template.md

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+## What type of PR is this? (check all applicable)
+
+- [ ] Refactor
+- [ ] Feature
+- [ ] Bug Fix
+- [ ] Optimization
+- [ ] Documentation Update
+
+## Description
+_A brief description of the work covered in this change._
+
+## Notes to Reviewer
+_If there is a particular part of the code that you need the reviewer to examine closely (e.g. some logic you are not sure about), please specify here._
+
+## How to test
+_Please replace this line with instructions on how to test your changes. Use screenshots or recordings if necessary._
+
+## Link to issues addressed
+- [ISSUE-XYZ](https://github.com/CodelyTV/pr-size-labeler/issues/XYZ)
+- [ISSUE-XYZ](https://github.com/CodelyTV/pr-size-labeler/issues/XYZ)