[MNT] Add Pull Request template (#241)

This PR adds a [.github/PULL_REQUEST_TEMPLATE.md] to standardize
contributions. It ensures that all future PRs include necessary details
like a summary of changes and a compliance checklist.

Fixes #83

---------

Co-authored-by: PGijsbers <p.gijsbers@tue.nl>

Author: Akarshkushwaha

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+# Description
+
+Please include a summary of the change and include relevant motivation and context. Mention any related issues, if this fixes an issue, include the text "Fixes: #..." with the appropriate issue number(s).
+
+# Checklist
+
+_Please check all that apply. You can mark items as N/A if they don't apply to your change._
+
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code in hard-to-understand areas, and provided or updated docstrings as needed
+- [ ] I have made corresponding changes to the documentation pages (`/docs`)
+- [ ] I have added tests that cover the changes
+- [ ] Tests pass locally.
+
+nb. If tests pass locally but fail on CI, please try to investigate the cause. If you are unable to resolve the issue, please share your findings.