Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Overview
+<!--  Please describe which issue this Pull Request targets
+
+If there is no issue, please create one so we can look into it before approving your PR.
+You can do so here: https://github.com/IntellectualSites/PlotSquared/issues/new/choose
+-->
+
+**Fixes #{issue number}**
+
+## Description
+
+## Checklist
+<!-- Make sure you have completed the following steps (put an "X" between of brackets): -->
+- [] I included all information required in the sections above
+- [] I tested my changes and approved their functionality
+- [] I ensured my changes do not break other parts of the code
+- [] I read and followed the [contribution guidelines](https://github.com/IntellectualSites/PlotSquared/blob/breaking/CONTRIBUTING.md)