add pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,33 @@
+# Descriptive pull request title
+
+## What does this implement/fix? Explain your changes
+
+...
+
+## Does this close any currently open issues?
+
+Fixes # (issue)
+
+## Any relevant code examples, logs, error output, etc?
+
+...
+
+## Any other comments?
+
+...
+
+## Checklist
+
+Put an `x` in the boxes that apply. You can also fill these out after creating
+the PR. If you're unsure about any of them, don't hesitate to ask. We're here to
+help! This is simply a reminder of what we are going to look for before merging
+your code.
+
+- [ ] I have read and understood the [contribution
+  guidelines](https://github.com/sbi-dev/sbi/blob/main/CONTRIBUTING.md)
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I performed linting and formatting as described in the [contribution
+  guidelines](https://github.com/sbi-dev/sbi/blob/main/CONTRIBUTING.md)
+- [ ] I rebased on `main` (or there are no conflicts with `main`)