Add pull request template

Author: Mab879

.github/pull_request_template.md

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+#### Description:
+
+- _Place a short description of the changes you made here. Replace this text. Don't use the italics format!_
+
+#### Rationale:
+
+- _Place the rationale for the pull request here. Replace this text. Don't use the italics format!_
+
+- Fixes # _Issue number here or remove this line if no issue exists._
+
+#### Review Hints:
+
+- _Place review hints here. Replace this text. Don't use the italics format!_
+
+- _Use this optional section to give any relevant information which could help the reviewer better understand and aid in testing the changes._
+
+- _Good examples are useful commands, if it is better to review all commits together or in a suggested sequence, any relevant discussion in other PRs or issues, etc._
+