Add pull request template (#223)

Initial very basic PR template. This is to start having better history, and start driving towards conventional commits so we can auto-document version changes.

Author: kitop

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+<!-- We follow the Conventional Commits guide: https://www.conventionalcommits.org/en/v1.0.0/#summary -->
+
+Please include a summary of the changes in this PR, as if it were a changelog. Include links to issues if possible.
+
+If there are any breaking changes list them below with an upgrade guide.
+
+BREAKING CHANGES: