add pull request template

Author: kaidesu

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+## What does this implement or fix?
+### Added
+- ...
+
+### Fixed
+- ...
+
+### Removed
+- ...
+
+## Does this close any currently open issues?
+- #123
+
+## Additional Notes
+Any additional notes or information that should be made or highlighted.
+
+## Screenshots
+Screenshots showcasing your update are helpful for reviewers (especially if its a visual update).