Add pull request template to standardize submissions

[no ci]

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+- [ ] I ran `npm run all` before opening this PR
+
+## Description
+
+<!-- Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change. -->
+
+<!-- Fixes # (issue) If any -->