docs: add check list

.github/pull_request_template.md

@@ -25,7 +25,6 @@ Example:
 -->
 
 # Are these changes tested?
-
 <!--
 We typically require tests for all PRs in order to:
 1. Prevent the code from being accidentally broken by subsequent changes
@@ -36,3 +35,7 @@ If tests are not included in your PR, please explain why (for example, are they
 Example:
 Yes.
 -->
+
+# Have you gone through the following checklist?
+- [ ] The PR title and commit messages adhere to guidelines here: https://github.com/spaceandtimelabs/sxt-proof-of-sql/blob/main/CONTRIBUTING.md. In particular `!` is used if and only if a breaking change has been introduced.
+- [ ] I have run the ci check script with `source scripts/run_ci_checks.sh`.