feat: Create pull_request_template.md

.github/pull_request_template.md

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+<!-- Thanks for contributing to Apollon2! Before you submit your pull request, please make sure to check the following boxes by putting an x in the [ ] (don't: [x ], [ x], do: [x]) -->
+<!-- If your pull request is not ready for review yet, create a draft pull request! -->
+
+### Checklist
+
+- [ ] I linked PR with related issue
+- [ ] I added multiple screenshots/screencasts of my UI changes
+
+### Motivation and Context
+
+<!-- Why is this change required? What problem does it solve? -->
+<!-- If it fixes an open issue, please link to the issue here. -->
+
+### Description
+
+<!-- Describe your changes in detail -->
+
+### Steps for Testing
+
+<!-- Please describe in detail how the reviewer can test your changes. -->
+
+1. ...
+
+### Screenshots
+
+<!-- Add screenshots to demonstrate the changes in the UI. -->
+<!-- Create a GIF file from a screen recording in a docker container https://toub.es/2017/09/11/high-quality-gif-with-ffmpeg-and-docker/ -->