feat: pull request template (#6)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Motivation
+
+<!--
+Explain briefly what this change aims to achieve and why it is important to do so.
+Please keep this description updated with any discussion that takes place so
+that reviewers can understand your intent. Keeping the description updated is
+especially important if they didn't participate in the discussion.
+-->
+
+## Changes
+
+<!--
+List the changes made to the code base. Per default, all commits are listed here.
+Please keep this description updated as you add new changes to the PR.
+-->
+
+## Tests done
+
+<!--
+List the tests that were done to verify the changes.
+-->
+
+## TODO
+
+- [x] I've assigned myself to this PR