Add the pull request template

Author: nbro

.github/pull_request_template.md

@@ -0,0 +1,13 @@
+# Pull Request
+
+Closes #
+
+<!--
+Use closes #X or fixes #X if this pull request closes or fixes issue number X. 
+For more details, see 
+https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue.
+
+Provide a brief description for this PR.
+
+Provide more details, if the linked issue does not provide them or there is no linked issue.
+-->